Home page of the microscope service parts, repair and spare parts online catalog - Sermik-Oplatek Mikroskopservice Dresden f.n.n.Z

Description of this part for the microscope.

Photomicroscope II (Phomi) microscope, but I understand it also fits the other Zeiss microscopes.

Description of this part for the microscope.

microscopes.

Description of this part for the microscope.

removed from a Zeiss stage P/N 47 33 56 (473356-9901), however stages with other part numbers (e.g. Zeiss P/N 4693640) have an identical design, therefore it most likely fits many models of round Zeiss stages.

Such stages are interchangeable and can be installed in many Zeiss microscopes, however they are most commonly used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope (so-called Zeiss Phomi)
- Zeiss Ultraphot

In the photo gallery there are detailed images of this element together with dimensions. Additionally, in the last photo an arrow indicates which part is being referred to and where it is located in the stage, in order to clearly identify this component.

Description of this part for the microscope.

from a Zeiss stage P/N 47 33 56 (473356-9901), however stages with other part numbers (e.g. Zeiss P/N 4693640) have an identical design, therefore it most likely fits many models of round Zeiss stages.

Such stages are interchangeable and can be installed in many Zeiss microscopes, however they are most commonly used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope (so-called Zeiss Phomi)
- Zeiss Ultraphot

In the photo gallery there are detailed images of this element together with dimensions. Additionally, in the last photo an arrow indicates which part is being referred to and where it is located in the stage, in order to clearly identify this component.

Description of this part for the microscope.

was removed from a Zeiss stage P/N 47 33 56 (473356-9901), however stages with other part numbers (e.g. Zeiss P/N 4693640) have an identical design, therefore it most likely fits many models of round Zeiss stages.

Such stages are interchangeable and can be installed in many Zeiss microscopes, however they are most commonly used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope (so-called Zeiss Phomi)
- Zeiss Ultraphot

In the photo gallery there are detailed images of this element together with dimensions. Additionally, in the last photo an arrow indicates which part is being referred to and where it is located in the stage, in order to clearly identify this component.

Description of this part for the microscope.

stage P/N 47 33 56 (473356-9901), however stages with other part numbers (e.g. Zeiss P/N 4693640) have an identical design, therefore it most likely fits many models of round Zeiss stages.

Such stages are interchangeable and can be installed in many Zeiss microscopes, however they are most commonly used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope (so-called Zeiss Phomi)
- Zeiss Ultraphot

In the photo gallery there are detailed images of this element together with dimensions. Additionally, in the last photo an arrow indicates which part is being referred to and where it is located in the stage, in order to clearly identify this component.

Description of this part for the microscope.

removed from a Zeiss stage P/N 47 33 56 (473356-9901), however stages with other part numbers (e.g. Zeiss P/N 4693640) have an identical design, therefore it most likely fits many models of round Zeiss stages.

Such stages are interchangeable and can be installed in many Zeiss microscopes, however they are most commonly used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope (so-called Zeiss Phomi)
- Zeiss Ultraphot

In the photo gallery there are detailed images of this element together with dimensions. Additionally, in the last photo an arrow indicates which part is being referred to and where it is located in the stage, in order to clearly identify this component.

Description of this part for the microscope.

stage surface - in other words: end stop.

This part was removed from a Zeiss stage P/N 47 33 56 (473356-9901), however stages with other part numbers (e.g. Zeiss P/N 4693640) have an identical design, therefore it most likely fits many models of round Zeiss stages.

Such stages are interchangeable and can be installed in many Zeiss microscopes, however they are most commonly used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope (so-called Zeiss Phomi)
- Zeiss Ultraphot

In the photo gallery there are detailed images of this element together with dimensions. Additionally, in the last photo an arrow indicates which part is being referred to and where it is located in the stage, in order to clearly identify this component.

Description of this part for the microscope.

a complete coarse focus mechanism (macro movement) and coaxial fine focus mechanism (micro movement)
- a complete base with illuminator holder, field diaphragm and filters
- a complete arm with tube holder and EPI illumination selector switch

See also item no. 99584 in this database – it is a similar microscope body that differs only in a few details.

The complete Zeiss Photomicroscope microscope stand may be useful in the following situations:
- if you are assembling your own microscope and purchasing individual components in order to build a system that fully meets your expectations
- if you own a Zeiss Universal microscope and would like to replace it with a Photomicroscope II model, it is sufficient to replace the stand because the remaining components are compatible
- if you own a Zeiss Photomicroscope microscope but its stand is in very poor condition, damaged or incomplete: it has non-functional vertical movement knobs, a damaged diaphragm, or other mechanical problems

Description of this part for the microscope.

supply:
Manufacturer: Carl Zeiss
Model: VWH 200/C 250 f-3b
Manufacturer P/N: 39 26 34 (also written as 392634)
Supported fluorescence lamps: HBO 200 W/4 L1, HBO 200 W/4 L2 and CSI 250W
Input voltage: 220 V – 240 V
Power rating: 900 VA

This power supply was supplied as standard with Zeiss Photomicroscope microscopes (commonly known as the Zeiss Phomi) whenever the microscope was equipped with an HBO high-pressure fluorescence illuminator (also referred to as a burner or lamp).

The same or very similar illuminators with identical electrical specifications were used in, among others:
- Zeiss Standard WL
- Zeiss Photomicroscope
- Zeiss Universal
- Zeiss Ultraphot
- such illuminators were also occasionally adapted for use with other microscope models, including those made by other manufacturers
Therefore, this power supply is suitable for all of the applications listed above.

Please note: the last photograph shows a dent in the housing. This does not affect the operation of the unit. Since the dent is located on the underside of the housing, it is not visible when the power supply is standing on a laboratory bench.

IMPORTANT: Always protect your eyesight when working with UV illumination. Never exceed the recommended service life of HBO high-pressure lamps. Always follow the operating instructions supplied with the fluorescence illuminator.

Description of this part for the microscope.

(Phomi) microscopes.

This is an intermediate tube forming the main optical module of the microscope. It is mounted onto the microscope arm, and the binocular head is then attached to this intermediate tube. The module integrates the following components:
- a third optical path (photo output), which is why this module is sometimes referred to as a trinocular tube
- an Optovar magnification changer with a Bertrand lens
- a dovetail mount for the objective revolver
- a large insert for a round filter and slots for additional inserts

This intermediate tube is compatible with the following microscopes:
- Zeiss Universal (Carl Zeiss Standard Universal)
- Zeiss Photomicroscope (Zeiss Phomi)

The Optovar magnification changer integrated into this intermediate tube features a rotating turret with the following positions:
- PH (Bertrand lens)
- 1.25×
- 1.6×
- 2×

The complexity of this design makes the module susceptible to damage of individual internal components, especially the optical elements (prisms and lenses).

Description of this part for the microscope.

This is a round plastic cap with a metal insert, designed to cover the output port of the EPI illuminator. It is removed when an EPI fluorescence illuminator turret is installed (for example, on the Zeiss Photomicroscope III RS).

Please note that some versions of the Zeiss Universal microscope do not have an EPI reflected-light illuminator port.

The accompanying video, using a Zeiss Photomicroscope II as an example, shows exactly where this cap is located on the microscope and how it is installed and removed.

On the secondary market, many Zeiss Phomi (Photomicroscope) and Zeiss Universal microscopes are missing this cap. As a result, dust can enter the illumination system (in other words, the light path). Why is this cap often missing?
- first, it can be removed very easily, so over the years it may simply get lost
- secondly, the microscope body and the EPI fluorescence illuminator turret are often sold separately, so after the turret has been removed, the EPI illuminator port remains uncovered

Description of this part for the microscope.

Photomicroscope (Phomi) microscopes.

This cover ring contains a small screw that secures the ring in place so that it fits tightly around the joint between the two microscope components.

The accompanying video, using a Zeiss Photomicroscope II as an example, shows exactly where this cover ring is located on the microscope and how it is installed and removed.

On the secondary market, many Zeiss Phomi (Photomicroscope) and Zeiss Universal microscopes are missing this cover ring, which may allow dust to enter the optical system. Why is this cover ring often missing?
- first, it can be removed very easily, so over the years it may simply get lost
- secondly, the microscope body and the trino intermediate tube are often sold separately, so this cover ring frequently ends up being included in neither the first transaction nor the second

Description of this part for the microscope.

it is a similar microscope body that differs only in a few details.

This Zeiss Phomi II microscope body includes:
- the coarse and fine focus block together with the focusing knobs
- the base (also called the foot or base) with the rear illuminator port, field diaphragm (iris diaphragm), and built-in filters
- the microscope arm with the intermediate tube mount (dovetail clamp), photographic film compartment, and all knobs and switches

When can a complete microscope body be useful?
- if you are assembling a microscope yourself and selecting every component so that the final configuration is exactly the way you want it
- if you have an older model (for example, a Zeiss Universal without EPI reflected-light capability) – replacing the stand effectively upgrades the microscope, while the remaining components can be transferred because they are compatible between these models
- if your microscope is damaged or in poor condition – in that case, this microscope body simply replaces the damaged part

Description of this part for the microscope.

light source to be connected. The lamp house is installed on the left side of the microscope, while the built-in mirror prism redirects the light beam into the EPI nosepiece.

Fluorescence light sources are most commonly connected to this mount, but it is completely universal. It contains no filters and can be used with LED, HBO, XBO, halogen or even classic incandescent lamp houses.

If the light source is lightweight (one of the newer models), it can be mounted without any additional supports. If a large, heavy lamp house is used, additional support frames are often employed to carry its weight (these are optional accessories and are not included).

In its current configuration, this mount accepts lamp houses with a 48 mm connection diameter. However, this mounting adapter can be removed, leaving a plain tube that can accept virtually any adapter, allowing almost any manufacturer's light source to be connected.

The last photograph in the gallery shows a Zeiss Photomicroscope III microscope with this lamp house mount installed. An arrow indicates its exact location, making it easy to identify this component.

The video gallery also contains two videos. The first presents this component from different angles and in close-up. The second demonstrates how to remove this EPI lamp house mount using a Zeiss Photomicroscope III microscope (commonly known as the Zeiss Phomi III) as an example.

Description of this part for the microscope.

Zeiss Universal
- Zeiss Photomicroscope (the so-called Zeiss Phomi)
- Zeiss Ultraphot

This holder allows interchangeable microscope stages to be mounted, meaning stages that are not screwed directly to the microscope stand. It also features two centering screws.

This holder consists of two parts:
- the so-called stage "support", which is mounted onto a dovetail guide using a quick-release clamping mechanism
- and the circular stage holder attached to it

If this circular holder for the interchangeable stage is removed, other microscope stages that are not interchangeable but instead mounted with four screws can be attached to the "support".

The Zeiss Universal, Zeiss Ultraphot, the earliest versions of the Zeiss Standard WL, and the first model of the Zeiss Photomicroscope were originally factory-equipped with this component in black.

The Zeiss Photomicroscope II, Zeiss Photomicroscope III, and the later versions of the Zeiss Standard WL were factory-equipped with this component in grey.

The colour of this component has no effect on compatibility. In other words, a component of either colour fits all of the microscope models listed above.

The component presented here is black.
If you're looking for the gray version, it's listed in this database under number 99583.
There you'll also find a video demonstrating how to disassemble this item, i.e., how to remove it from the microscope stand.

Description of this part for the microscope.

called Zeiss Phomi)
- Zeiss Standard WL 89
- Zeiss Universal
- Zeiss Ultraphot

This complete module consists of the following parts:
- the section with the condenser focusing knob for height adjustment, mounted onto a dovetail guide using a quick-release clamping mechanism
- the condenser holder with a toothed rack, condenser retaining screw and two centering screws
- a swing-out holder for a 32 mm round filter
- a swing-out wide field lens used to provide even illumination of the specimen when observing with low-magnification objectives

This holder accepts condensers with a dovetail mount – it is not intended for condensers with a diameter of 37 mm or 39.5 mm.

The Zeiss Universal, Zeiss Ultraphot, the earliest versions of the Zeiss Standard WL, and the first model of the Zeiss Photomicroscope were originally factory-equipped with this component in black.

The Zeiss Photomicroscope II, Zeiss Photomicroscope III, and the later versions of the Zeiss Standard WL were factory-equipped with this component in grey.

The colour of this component has no effect on compatibility. In other words, a component of either colour fits all of the microscope models listed above.

The component presented here is black.
If you're looking for the gray version, it's listed in this database under number 99578.
There you'll also find a video demonstrating how to disassemble this item, i.e., how to remove it from the microscope stand.

Description of this part for the microscope.

microscopes:
- Zeiss Standard WL
- Zeiss Universal
- Zeiss Photomicroscope I
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS

Mechanically, this toothed rack is located on the focusing block (gear block), beneath the dovetail guide. The microscope stage and microscope condenser are mounted on this guide.

Description of this part for the microscope.

mounting interface for the main optical tube, with the photo port on one side and the dovetail rail for attaching the objective nosepiece on the other.

In the last photographs in the gallery, an arrow indicates exactly which component is being shown and where it is located in the microscope. This makes it possible to identify this microscope part unambiguously.

Description of this part for the microscope.

microscope base. It transfers the light beam from the illuminator, homogenises it (the image of the filament is diffused by means of a diffuser), and then properly collimates it using a collimating lens. The prepared light beam is then directed to the deflecting mirror (this is a separate microscope component).

This is part of the transmitted-light optical path. The diffuser (frosted ground glass) and the collimating lens are housed inside a metal enclosure that serves as a heat sink for the halogen lamp. The complete assembly forms the illuminator housing.

This particular collector with frosted ground glass was removed from a Carl Zeiss Photomicroscope (also known as Zeiss PM / Zeiss Phomi).
It fits the following microscopes (this is not a complete list):
- Zeiss Photomicroscope (Zeiss PM / Phomi)
- Zeiss Photomicroscope II (Zeiss PM2 / Phomi II)
- Zeiss Photomicroscope III RS (Zeiss PM3 RS / Phomi III)
- Zeiss Universal
- Zeiss Ultraphot
- most likely also Zeiss Standard 16 / 18 / WL / WL 89 / GFL microscopes

VERY IMPORTANT: This component is intended for the 6V 15W incandescent illuminator. Zeiss microscopes may be equipped either with a 6V 15W incandescent illuminator (a tubular illuminator inserted into the microscope base) or with an external halogen Lampenhaus mounted to the rear of the microscope base. Microscope versions equipped with a halogen illuminator use a different illuminator holder than the one presented here.

Other names used for this component:
- illuminator holder with frosted filter
- illuminator tube
- illuminator holder with frosted ground glass
- sometimes the foreign-language term "Lampenhaus" is also used, although it is not a precise name for this component

The last photographs in the gallery show the base of a Zeiss Photomicroscope III RS. Arrows indicate exactly which component is being offered and where it is located inside the microscope base, making it possible to identify this component unambiguously.

Description of this part for the microscope.

phase contrast and darkfield) allow a phase contrast condenser to be configured individually. This makes it possible to use exactly the observation techniques and exactly the microscope objectives required.

Basic parameters of this phase annulus:
Manufacturer: Carl Zeiss (Oberkochen, West Germany)
Condenser marking: "2"
For objectives: marked "Ph2", i.e. magnifications from 16x to 40x
Material: glass mounted in a metal retaining ring with flange
Outside diameter of the retaining ring: 22 mm
Phase annulus glass diameter: 16 mm
Height of the retaining ring: 3.5 mm

Important: this microscope component (phase annulus / phase diaphragm) is not intended for any specific microscope model. It is a component used to upgrade or repair a microscope phase contrast condenser. It is not intended for upgrading or repairing one specific condenser model. Many Carl Zeiss condenser models have a suitable opening into which this phase annulus can be inserted.

This particular phase annulus was removed from a fluorescence phase contrast condenser — an older version of the Zeiss condenser P/N 46 52 78. Before installing it in your condenser, carefully compare the shape of its housing and the dimensions of the retaining ring.

The last photograph in the gallery shows the turret disc of a Zeiss phase contrast condenser. An arrow indicates this very phase annulus — the one offered here — already installed.

Description of this part for the microscope.

condensers.

Basic parameters of this clear glass insert:
Manufacturer: Carl Zeiss (Oberkochen, West Germany)
Material: glass mounted in a metal retaining ring with flange
Outside diameter of the retaining ring: 22 mm
Diameter of the clear glass disc: 16 mm
Height of the retaining ring: 3.5 mm

Below are some example applications for this clear glass blank. It can be printed or fitted with, among others:
- a phase annulus or darkfield annulus matching the original one that was installed in the condenser but has become damaged
- an annulus missing from the condenser
- coloured Rheinberg rings
- oblique illumination diaphragms producing a DIC-like effect
- a Hoffmann modulation contrast pattern
- phase annuli for objectives made by other manufacturers, for example Carl Zeiss Jena PhV
- any completely custom DIY design

This particular clear glass ring insert was removed from a fluorescence phase contrast condenser — an older version of the Zeiss condenser P/N 46 52 78. Before installing it in your condenser, carefully compare the shape of its housing and the dimensions of the retaining ring.

Interchangeable diaphragm carriers (whether for phase contrast or, for example, darkfield) make it possible to configure a phase contrast condenser exactly as required. This allows the condenser to support precisely the observation techniques and microscope objectives needed.

The clear glass blank presented here is not a component intended for any specific microscope model. Instead, it is used to upgrade or repair a microscope phase contrast condenser. Likewise, it is not dedicated to any specific condenser model. Many Carl Zeiss condenser models have a suitable opening into which this complete insert can be fitted and customised with your own pattern.

The last photograph in the gallery shows the turret disc of a Zeiss phase contrast condenser. An arrow indicates the clear glass ring insert offered here, already installed.

Description of this part for the microscope.

inside the microscope base. It includes a mechanism that allows these filters to be inserted into or removed from the light path using control buttons. Since more than one filter can be placed in the light path at the same time, the mechanism also includes an additional (seventh) button that removes all filters from the light path simultaneously. Because of this seventh button, some descriptions incorrectly state that the microscope base contains seven filters.

The following filters are installed in this filter cassette:
- NCB filter (blue conversion filter that transforms yellow incandescent lamp light into naturally white light), Zeiss P/N 46 78 50 (yellow stripe on the push button)
- VG 9 green filter, Zeiss P/N 46 78 05 (green stripe on the push button)
- two neutral density filters 0.5, Zeiss P/N 46 78 40 (light grey stripes on the push button)
- neutral density filter 0.12, Zeiss P/N 46 78 41 (grey stripe on the push button)
- neutral density filter 0.03, Zeiss P/N 46 78 42 (dark grey stripe on the push button)

Combinations of the neutral density filters provide stepwise light transmission values ranging from 1.5% to 100%.

Each of these filters can be removed from its holder, resulting in a standard 32 mm round microscope filter that can also be used in microscopes made by other manufacturers. In addition, any other 32 mm round filter can be installed in this filter cassette, allowing the filter set of the microscope to be configured freely.

This filter cassette with its complete control mechanism fits all versions of Carl Zeiss Photomicroscope microscopes (also known as Zeiss PM or Zeiss Phomi) as well as Zeiss Universal microscopes. However, there are also some less common variants of the Zeiss Universal that do not include this filter mechanism inside the microscope base. Importantly, the Carl Zeiss Ultraphot microscope does not use this component.

The last photographs in the gallery indicate with an arrow exactly which component is being offered and where it is located inside the microscope. This allows unambiguous identification of the part.

Description of this part for the microscope.

applications.

Replaceable diaphragms (both for phase contrast and darkfield) for phase contrast condensers allow the condenser to be configured individually. Thanks to this, it can support exactly the observation techniques and exactly the microscope objectives that are required.

Important: by installing the fluorescence-polarization diaphragm presented here, a condenser currently equipped with standard phase contrast diaphragms can be upgraded with this unique function. A detailed description of the capabilities offered by this technique is provided below.

Basic parameters of this phase contrast diaphragm:
Manufacturer: Carl Zeiss (Oberkochen, West Germany)
Condenser marking: "2". On the Zeiss condenser P/N 46 52 78 this position is marked in blue
For microscope objectives: to obtain phase contrast operation, use microscope objectives marked "Ph2", i.e. objectives with magnifications from 16x to 40x
Substrate material: glass mounted in a metal holder with a flange
Ring material: polarizing film
Outside diameter of the retaining ring: 22 mm
Glass disc diameter: 16 mm
Retaining ring height: 3.5 mm

Important: this component (phase contrast annulus / phase contrast diaphragm) is not intended for a specific microscope model. It is a component for upgrading or repairing a microscope phase contrast condenser. It is not intended for upgrading or repairing any specific condenser model. Many Carl Zeiss condenser models have a matching opening into which this phase contrast annulus can be installed.

In the Carl Zeiss condenser P/N 46 52 78, the phase annuli in positions 2 and 3 are not ordinary openings in an opaque mask but openings in a polarizing film. The polarization direction of these annuli is N-S, so the direct light beam that forms the phase contrast image is linearly polarized. Since it is polarized, its intensity can be adjusted continuously with a second polarizer – without any mechanical parts, diaphragms or shutters.

This second polarizer can be any pair of rotatable polarizing filters. In the original Zeiss design, this is the Carl Zeiss light control unit P/N 47 72 20 with two independently rotatable polarizers mounted beneath the condenser. This makes it possible to switch on phase contrast while simultaneously reducing the illumination intensity to a safe level.

- when the polarizer is aligned parallel to the N-S axis of the annulus – full transmission, maximum phase contrast beam, full-strength phase contrast image;
- when the polarizer is crossed (E-W) – the annulus "goes dark", the objective phase plate no longer receives the direct beam, and the phase contrast image disappears;
- when the polarizer is set to intermediate positions – smooth adjustment of the contribution of the phase contrast image.

When the illumination source is a fluorescence lamp (or, of course, an LED FL light source), simply rotating the polarizer beneath the condenser (together with removing the excitation filter) allows the user to switch from a fluorescence image to a conventional phase contrast image. With the polarizer crossed and the excitation filter installed, the phase annulus is extinguished and only pure fluorescence is visible; as the polarizer is rotated, the phase contrast image gradually increases and is superimposed on the fluorescence image. The second polarizer in unit P/N 47 72 20 is additionally used to attenuate the overall illumination intensity (to protect the specimen or to control the specimen's exposure to fluorescence light).

And now an interesting note from the Ultraphot-shop website https://www.microscopeparts.eu/(http://www.the-ultraphot-shop.org.uk/bicolor.htm), © Spike Walker 2007:

Because the annulus is a linear N-S polarizer, it can be used to produce coloured phase contrast: when a two-colour polarizing filter (Cokin type) is placed between the microscope polarizer and the condenser annulus, the specimen takes on the colour of the illuminating annulus against the background colour of the remaining part of the disc – for example, an orange specimen on a green background when using a red-green filter.

This particular phase contrast annulus was removed from a fluorescence phase contrast condenser – an older version of the Zeiss condenser P/N 46 52 78. Before deciding to install it in your condenser, carefully compare the shape of its housing and the dimensions of the retaining ring.

The last photograph in the gallery shows the turret from a Zeiss phase contrast condenser. The arrow indicates the phase contrast annulus offered here, already installed.

Description of this part for the microscope.

applications.

Replaceable diaphragms (both for phase contrast and darkfield) for phase contrast condensers allow the condenser to be configured individually. Thanks to this, it can support exactly the observation techniques and exactly the microscope objectives that are required.

Important: by installing the fluorescence-polarization diaphragm presented here, a condenser currently equipped with standard phase contrast diaphragms can be upgraded with this unique function. A detailed description of the capabilities offered by this technique is provided below.

Basic parameters of this phase contrast diaphragm:
Manufacturer: Carl Zeiss (Oberkochen, West Germany)
Condenser marking: "3". On the Zeiss condenser P/N 46 52 78 this position is marked in blue
For microscope objectives: to obtain phase contrast operation, use microscope objectives marked "Ph3", i.e. objectives with magnifications from 40x to 100x
Substrate material: glass mounted in a metal holder with a flange
Ring material: polarizing film
Outside diameter of the retaining ring: 28 mm
Retaining ring height: 6 mm

Important: this component (phase contrast annulus / phase contrast diaphragm) is not intended for a specific microscope model. It is a component for upgrading or repairing a microscope phase contrast condenser. It is not intended for upgrading or repairing any specific condenser model. Many Carl Zeiss condenser models have a matching opening into which this phase contrast annulus can be installed.

In the Carl Zeiss condenser P/N 46 52 78, the phase annuli in positions 2 and 3 are not ordinary openings in an opaque mask but openings in a polarizing film. The polarization direction of these annuli is N-S, so the direct light beam that forms the phase contrast image is linearly polarized. Since it is polarized, its intensity can be adjusted continuously with a second polarizer – without any mechanical parts, diaphragms or shutters.

This second polarizer can be any pair of rotatable polarizing filters. In the original Zeiss design, this is the Carl Zeiss light control unit P/N 47 72 20 with two independently rotatable polarizers mounted beneath the condenser. This makes it possible to switch on phase contrast while simultaneously reducing the illumination intensity to a safe level.

- when the polarizer is aligned parallel to the N-S axis of the annulus – full transmission, maximum phase contrast beam, full-strength phase contrast image;
- when the polarizer is crossed (E-W) – the annulus "goes dark", the objective phase plate no longer receives the direct beam, and the phase contrast image disappears;
- when the polarizer is set to intermediate positions – smooth adjustment of the contribution of the phase contrast image.

When the illumination source is a fluorescence lamp (or, of course, an LED FL light source), simply rotating the polarizer beneath the condenser (together with removing the excitation filter) allows the user to switch from a fluorescence image to a conventional phase contrast image. With the polarizer crossed and the excitation filter installed, the phase annulus is extinguished and only pure fluorescence is visible; as the polarizer is rotated, the phase contrast image gradually increases and is superimposed on the fluorescence image. The second polarizer in unit P/N 47 72 20 is additionally used to attenuate the overall illumination intensity (to protect the specimen or to control the specimen's exposure to fluorescence light).

And now an interesting note from the Ultraphot-shop website https://www.microscopeparts.eu/(http://www.the-ultraphot-shop.org.uk/bicolor.htm), © Spike Walker 2007:

Because the annulus is a linear N-S polarizer, it can be used to produce coloured phase contrast: when a two-colour polarizing filter (Cokin type) is placed between the microscope polarizer and the condenser annulus, the specimen takes on the colour of the illuminating annulus against the background colour of the remaining part of the disc – for example, an orange specimen on a green background when using a red-green filter.

This particular phase contrast annulus was removed from a fluorescence phase contrast condenser – an older version of the Zeiss condenser P/N 46 52 78. Before deciding to install it in your condenser, carefully compare the shape of its housing and the dimensions of the retaining ring.

The last photograph in the gallery shows the turret from a Zeiss phase contrast condenser. The arrow indicates the phase contrast annulus offered here, already installed.

Description of this part for the microscope.

47 20 03 - 9906 (alternative notation: 472003).

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located inside the microscope. This makes it possible to identify the component unambiguously.

Description of this part for the microscope.

in the microscope base. In the operating manual (available here: https://www.science-info.net/docs/zeiss/Photomicroscope3-Transmitted-Light.pdf) this component is identified as item 27 (figure on page 4, description on page 5).

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located inside the microscope. This makes it possible to identify the component unambiguously.

Description of this part for the microscope.

be Zeiss catalog number P/N 25 444

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located inside the microscope. This makes it possible to identify the component unambiguously.

Description of this part for the microscope.

hand side of the microscope base. In the operating manual (available here: https://www.science-info.net/docs/zeiss/Photomicroscope3-Transmitted-Light.pdf) they are identified as items 18 and 30 (figure on page 4).

According to the operating manual, the "!" button "has several functions", while the "A" button is described as "camera shutter ready for photography".

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located inside the microscope. This makes it possible to identify the component unambiguously.

Description of this part for the microscope.

left-hand side of the microscope base. In the operating manual (available here: https://www.science-info.net/docs/zeiss/Photomicroscope3-Transmitted-Light.pdf) they are identified as items 14 and 15 (figure on page 4).

According to the operating manual, the "B" button opens the camera shutter electrically for as long as it is pressed. Releasing the button closes the shutter.

The "T" button opens the camera shutter and keeps it open. Pressing it again releases the mechanism and closes the shutter.

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located inside the microscope. This makes it possible to identify the component unambiguously.

Description of this part for the microscope.

manual (available here: https://www.science-info.net/docs/zeiss/Photomicroscope3-Transmitted-Light.pdf) it is identified as item 13 (figure on page 4).

The indicator displays the supply voltage of the microscope illumination. The scale provides readings in the ranges of 0–12 V and 0–6 V.

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located inside the microscope. This makes it possible to identify the component unambiguously.

Description of this part for the microscope.

In the operating manual (available here: https://www.science-info.net/docs/zeiss/Photomicroscope3-Transmitted-Light.pdf) it is identified as item 16 (figure on page 4).

According to the manufacturer's operating manual, this is a brightness indicator used during photomicrography.

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located inside the microscope. This makes it possible to identify the component unambiguously.

Description of this part for the microscope.

(Oberkochen, West Germany).

These microscope stages were fitted to, among others:
- Zeiss Standard WL / WL 89
- Zeiss Universal
- Zeiss Photomicroscope (PM / Phomi)
- Zeiss Photomicroscope II (PM II / Phomi II)
- Zeiss Photomicroscope III (PM3 RS / Phomi III)
- Zeiss Ultraphot

The round Zeiss stages used on this microscope series incorporate the front-to-back travel mechanism within the main stage body. The side-to-side movement, however, is integrated into the specimen holder assembly itself. That is exactly the stage component presented here.

This is a component of the microscope stage rather than a component dedicated to a particular microscope model. Since this stage can be fitted to many Carl Zeiss microscopes, this specimen holder assembly is likewise compatible with numerous Carl Zeiss models.

This complete assembly consists of the following components:
- side-travel control knob
- internal worm shaft providing lateral movement
- specimen holder with spring-loaded specimen clamp
- the specimen holder is mounted on a carriage travelling along the worm shaft

Important: although this component belongs to a round rotating microscope stage, it is not part of a polarizing stage. It belongs to a standard transmitted-light stage intended for bright-field and dark-field microscopy.

The following dimensions determine compatibility and whether this assembly can be installed on a particular microscope stage:
- spacing of the two side locating pins: 33.5 mm, measured from the outside edge of one pin to the outside edge of the other
- diameter of the locating pins: 2.5 mm each
- centre-to-centre spacing of the locating pins: 31.5 mm
- diameter of the central mounting screw securing the assembly to the stage: 3 mm
- location of the mounting screw: centrally positioned between the locating pins

If the spacing of the locating pins matches, this assembly can also be installed on microscope stages manufactured by other companies.

Individual components of this assembly are frequently damaged. Replacing the complete assembly offered here can solve, among others, the following problems:
- when the side-travel control knob has been broken, bent or otherwise damaged; this is common because the knob protrudes beyond the outline of the microscope stage and is mounted on a relatively slender shaft
- when the mounting screw securing the complete assembly to the stage breaks; this is also common because the assembly projects beyond the flat surface of the stage
- when the worm shaft becomes worn, causing the specimen holder to move unevenly or, in some cases, preventing movement altogether
- when the spring inside the specimen clamp breaks; this is a well-known weakness of this design

The gallery photographs show the exact dimensions of this component. The final photographs additionally show the complete microscope stage from which this specimen holder assembly was removed. An arrow indicates the exact stage component being offered, making visual compatibility easy to verify. The accompanying video also demonstrates the operation of the spring-loaded specimen clamp.

Description of this part for the microscope.

mechanism is precise focusing - converting the horizontal movement of the adjustment knob into precise vertical movement.

This fine focus mechanism rack fits the following microscopes:
- Zeiss Standard WL / WL 89
- Zeiss Universal
- Zeiss Photomicroscope
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS

Description of this part for the microscope.

In the operating manual (available here: https://www.science-info.net/docs/zeiss/Photomicroscope3-Transmitted-Light.pdf) it is identified as item 17 (illustration on page 4).

According to the manufacturer's manual, this microscope component is used to adapt the automatic exposure system to the sensitivity of the film in use. The selector adjusts the setting in 3 DIN increments (from DIN 6 to DIN 39) or doubles the ASA values (from ASA 3.2 to ASA 6300).

Several names are used for this microscope model, including:
- Carl Zeiss Photomicroscope III
- Carl Zeiss Phomi III
- Carl Zeiss PM III
- Zeiss Photomicroscope III RS
- Zeiss Phomi 3
- Zeiss PM3 RS

The photographs in the gallery include an arrow indicating exactly which component is being offered and where it is located on the microscope. This allows the part to be identified unambiguously.

Description of this part for the microscope.

are equipped with a base illuminator using a 6 V 15 W lamp. This can be replaced with:
a) a large 60-watt illuminator using a 12 V 60 W lamp
b) a halogen illuminator

This listing presents the illuminator described in option a), namely the 60 W incandescent lamp version.

Basic specifications of this illuminator:
Manufacturer: Carl Zeiss (Oberkochen, West Germany)
Model: 60-watt illuminator
Lamp voltage: 12 V
Lamp house mounting method: circular dovetail
Cooling: passive. The entire large lamp house also serves as a heat sink, dissipating the heat generated by the 60-watt lamp
Lamp socket centering screws: yes, the lamp socket is equipped with centering screws
Diffuser: yes, inside the lamp house, in front of the lamp condenser lens (the so-called illumination collector), there is a matte diffuser mounted in a flip-out holder

This particular unit was removed from a Carl Zeiss Photomicroscope II. However, it is compatible with most microscopes of the Zeiss Standard series.

This illuminator fits the following microscopes:
- Zeiss Standard 16 / GFL
- Zeiss Standard WL / WL 89
- Zeiss Universal
- Zeiss Photomicroscope
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS
- and also the Zeiss IM 35 / ICM 405 inverted microscope

The following is a quotation from the Zeiss Photomicroscope II instruction manual:

60-watt illuminator

Instead of the 6-v. 15-w base illuminator, the 60-watt illuminator may be firmly connected to the microscope stand. For this purpose, the collector tube with lamp condenser, 46 70 50, must be removed after unscrewing the bottom plate and replaced by the connecting tube, 46 70 41 (Fig. 15). The 60-watt illuminator is mounted in the usual manner with the aid of a dovetail ring, like a body tube, for example.

The variable transformer is identical to the one for the base illuminator and supplies voltages from 0 ... 20 volts. When this equipment is used, the red scale of the voltmeter applies.

Several important points should be mentioned:
- if your microscope is currently equipped with the standard 6 V 15 W illumination system, the illuminator mounting adapter must also be replaced (this is described in the instruction manual quoted above)
- the lamp house of this illuminator is finished in grey. Some Carl Zeiss Standard series microscopes have black, cream or hammered-finish housings. This illuminator is mechanically compatible with those models, although the colour may not be an aesthetically perfect match
- power supplies with a rated output of exactly 60 W are virtually unavailable on the second-hand market. In practice, 12 V 100 W power supplies are used to operate this light source
- please note that exactly the same (!) illuminator is also used on the Zeiss IM 35 / ICM 405 inverted microscopes. Please also refer to the description of illuminator No. 00697 in this database. YES – these are exactly the same illuminators. However, that particular unit was removed from an inverted microscope and therefore has its own separate description. You will also find additional photographs there. In the Zeiss IM 35 instruction manual, the lamp socket is referred to as "Lamp socket 60 P/N 46 80 15", while the lamp house is referred to as "Lamp housing with lamp condenser P/N 46 72 27"
- this illuminator can be used for both transmitted-light and reflected-light (EPI) illumination
- if you would like to manufacture your own DIY illuminator mounting adapter because you do not have the original Zeiss part (P/N 46 70 41), the following information may be useful: the circular dovetail on this illuminator has a diameter of 43 mm, which is the same as on many microscope condensers and mono-, binocular and trinocular microscope heads. This means that, for example, a microscope head mounting adapter can be used as the basis for manufacturing a custom DIY illuminator adapter

Important: The photographs show a lamp installed in the lamp socket. This lamp DOES NOT LIGHT because it is burned out. It is shown only so that you can see which lamp model is used in this illuminator.

Description of this part for the microscope.

microscopes:
- Zeiss Standard WL
- Zeiss Universal
- Zeiss Photomicroscope I
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS

There are two such roller guides in the focusing block (the so-called gear block) – one on the right side and one on the left side of the block. Both are identical.

Users and people involved in microscope repair and restoration very often use other names for this component, including incorrect ones, such as:
- bearing guide
- roller rail
- rail with ball bearings
- ball bearing guide