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.

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.

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.

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.

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.

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.

(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.

Zeiss Universal
- Zeiss Photomicroscope I
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS
- Zeiss Ultraphot

The module consists of the following elements:
- a metal push-pull rod with position markings (white, red and black stripes, as well as a blank/silver marking)
- a round knob screwed onto the end of this rod
- a mounting for attaching the rod to the prism housing
- a cover protecting and covering the internal mechanism

This component is susceptible to various types of damage, including:
- because the rod is quite long when pulled out (approx. 7 cm), it can easily become bent, especially during transport of the microscope. A bent rod can no longer smoothly switch the prisms in the optical path of the intermediate tube
- the Bakelite knob screwed onto this rod can easily chip or become unscrewed and lost
- any of these elements, including the protective cover, can be lost during microscope servicing

The last photo shows the complete intermediate tube, with an arrow indicating which element this is and where it is located. This allows for unambiguous identification of the service component presented here.

Description of this part for the microscope.

Universal / Zeiss Photomicroscope class microscopes there is a rotating, turret-type "Optovar" magnification changer in the intermediate tube, above the objective nosepiece (not always - please note the remark on this further down in the description).

What I am offering here is the rotating lens wheel of this magnification changer together with the spring click-stop mechanism.

This item fits the magnification changer used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope I
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS
- Zeiss Ultraphot

Some models of the Zeiss Universal microscope have no magnification changer in the intermediate tube.

The magnification changer turret offered here has 4 positions:
- PH - this is an empty position, because the Bertrand lens is located higher up in the intermediate tube, in a horizontally sliding tube, together with the prisms that split the light beam towards the photo port
- 1,25x - this is the lens of the basic magnification for observation
- 1,6x - additional magnification lens
- 2x - additional magnification lens

In addition, this item has a sheet-metal detent (the so-called click-stop) that locks the lens wheel in the exact position.

VERY IMPORTANT - this is not a complete "Optovar" magnification changer. It is a service part - a component for repairing a magnification changer.

This item is intended for those who already have such a magnification changer in their microscope, but it needs replacement or repair, for example because its lens (or one of its lenses) has come apart (delamination) or has been damaged by mould. In that case the item offered here can be used to replace the whole lens wheel, or a particular lens can be taken out of it.

Over the years the Carl Zeiss Photomicroscope series microscopes have acquired various names by which users commonly refer to them. These include, among others:
- Zeiss Photomikroskop
- PM, e.g. Zeiss PM II or Zeiss PM III
- Zeiss Phomi, e.g. Zeiss Phomi II
It should also be mentioned that the Zeiss Photomicroscope microscopes were sold under the Opton brand as well.

The last photo in the gallery shows the photo intermediate tube removed from a Carl Zeiss Photomicroscope III microscope, with an arrow indicating which item is meant and where this lens turret ring is located in that tube.
In addition, the film available in the video gallery shows this lens turret from various angles and the movement of its moving parts.

Description of this part for the microscope.

microscopes, the intermediate tube (https://www.microscopeparts.eu/part/99571) contains a horizontally mounted barrel with a prism that splits the light towards the trinocular/photo port. The individual positions are switched by pulling and pushing the control knob (https://www.microscopeparts.eu/part/91040). The Amici-Bertrand lens, used for aligning DIC and the phase contrast rings, is mounted in the same place - and that is the lens presented here.

Why is this lens located in the light-splitting module, even though the PH marking is on the turret of the Optovar magnification changer? The reason is simple: the first Zeiss Universal models had no magnification changer, so the Amici-Bertrand lens was mounted next to the beam splitting prism and is swung in with the same knob that switches the photo mode. When the magnification changer (with the 1.25x / 1.6x and 2x positions) was added to the newer models, a PH position was provided on the changer as well, containing no lens at all (an empty slot) - because the Bertrand lens for phase contrast stayed where it had always been. You can see the construction of the magnification changer and this empty slot here: https://www.microscopeparts.eu/part/91043.

This lens fits the intermediate tubes used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope I
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III / III RS
- Zeiss Ultraphot

This is a service part for those who need to replace this element in their microscope, or who want to use the Amici-Bertrand lens for their own DIY projects.

Over the years, Carl Zeiss Photomicroscope series microscopes have acquired various names commonly used by their owners. These include, among others:
- Zeiss Photomikroskop
- PM, e.g. Zeiss PM II or Zeiss PM III
- Zeiss Phomi, e.g. Zeiss Phomi II
It should also be mentioned that Zeiss Photomicroscope microscopes were sold under the Opton brand as well.

Description of this part for the microscope.

In Zeiss Universal / Zeiss Photomicroscope class microscopes, the intermediate tube (https://www.microscopeparts.eu/part/99571) contains a mounting part onto which the nosepiece is slid. This nosepiece holder is identical in intermediate tubes without a magnification changer and in those with an Optovar.

This is exactly the part offered here - the holder used to attach the nosepiece to the intermediate tube.

This nosepiece holder includes:
- a male dovetail for mounting the nosepiece
- a clamping screw that locks the nosepiece in place once fitted
- an empty slot for an optional narrow slider
- two blanking covers for this slot
- an empty slot for a wide filter slider

This holder fits the intermediate tubes used in the following microscopes:
- Zeiss Universal
- Zeiss Photomicroscope I
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III / III RS
- Zeiss Ultraphot

This is a service part for those who need to replace this component in their microscope. It is neither a complete nosepiece nor a complete intermediate tube.

Replacing this nosepiece holder can remedy, among others, the following problems:
- if the nosepiece wobbles after being mounted in the tube, slides on too easily and does not sit firmly
- if the nosepiece clamping screw is bent, broken off or lost
- if the slider slot is damaged

Over the years, the Carl Zeiss Photomicroscope series microscopes have acquired various names that users commonly call them by. These include, among others:
- Zeiss Photomikroskop
- PM, e.g. Zeiss PM II or Zeiss PM III
- Zeiss Phomi, e.g. Zeiss Phomi II
It is also worth mentioning that Zeiss Photomicroscope microscopes were also sold under the Opton brand.

See the last photos in the gallery: one shows a complete intermediate tube, with an arrow indicating which part this is and exactly where it is located. The other shows two intermediate tubes side by side - one with the Zeiss logo and an integrated magnification changer, and one with the Opton brand logo, without a magnification changer. The comparison shows that both tubes have the same nosepiece mounting holder.
In addition, the video gallery contains a film showing how to remove and insert the blanking covers of the narrow slider slot and how to turn the clamping screw.