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.

only the holder is provided).

Description of this part for the microscope.

rare on the used microscope market. It can be used with microscopes such as:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Description of this part for the microscope.

filter is exceptionally rare on the used microscope market. It can be used with microscopes such as:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Description of this part for the microscope.

I don't remember the specifications for the Jenatech.

Note: this is the version with the frosted glass; there are also versions without it.

Description of this part for the microscope.

documentation, this element is referred to in German as -Fototubus 100/100 und Tubusträger-.

This is a photographic tube on which a binocular microscope head is mounted - in this configuration it becomes a complete trinocular system. At the top there is an optical output where a camera or photographic device can be mounted.

Basic technical parameters:
- light beam splitting: 0/100 and 100/0
- head mounting method: dovetail 41.5 mm
- mounting method on the photographic port: dovetail 41.5 mm
- internal lens: additional Bertrand lens e.g. for phase contrast adjustment
- extras: slot for installing a filter wheel

Note - despite certain similarities, this microscope element DOES NOT FIT Carl Zeiss Jena Jenamed microscopes.

Description of this part for the microscope.

Jenalumar microscope.
This element has fins that function as a heat sink for heat dissipation.

Description of this part for the microscope.

Jenalumar 50

Please note the following:
- both microscopes listed here use this illuminator for EPI fluorescence, i.e. reflected light. This is not transmitted-light fluorescence.
- this illuminator requires a Carl Zeiss Jena SH 50 power supply for operation
- the Carl Zeiss Jena Jenalumar microscope was produced in two variants - this illuminator fits the Jenalumar version with two small, separate illumination modules
- information can be found on the Internet claiming that this illuminator is suitable for Carl Zeiss Jena Jenavert microscopes. This is NOT correct.
- an HBO lamp is not the same as an XBO lamp.
- Jenamed microscopes other than the "Fluorescence" version have a differently mounted head and this illuminator CANNOT be installed on them.

Important - operating used, overheated HBO lamps, lamps with unknown operating time or from an uncertain source may result in explosion, damage to the illuminator, contamination of the room and a risk to the user's life and health. For this reason, this illuminator DOES NOT INCLUDE a light source (i.e. it does not include the HBO mercury burner).

Description of this part for the microscope.

Always exercise extreme caution when purchasing used mercury vapor lamps.

Technical specifications:
Manufacturer: VEB Narva
Type: HBO 200 F
Power: 200 watts
Lamp voltage: 50 - 65 V
Lamp current: 3.4 - 4.4 A DC
Warm-up time: 5 - 8 min
Ignition system: HF ignition
Rated service life: 200 h
Length: 100 mm
Width: 42 mm

Description of this part for the microscope.

rare on the used microscope market. It can be used with microscopes such as:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Description of this part for the microscope.

rare on the used microscope market. It can be used with microscopes such as:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Description of this part for the microscope.

rare on the used microscope market. It can be used with microscopes such as:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Description of this part for the microscope.

allows two filters to be inserted into the EPI optical path, for example a frosted diffuser filter, a blue colour-balancing filter or a green filter used to facilitate metallurgical observations.

The photographs in the gallery show the exact dimensions of this slide.

Description of this part for the microscope.

positions: 6
- Thread: M25
- Mounting method: screw-mounted to the intermediate bracket (nosepiece holder), between the nosepiece and the microscope body

The complete objective nosepiece module for Carl Zeiss Jena Jenalumar or Jenaval microscopes consists of:
- the objective revolver (also called the objective nosepiece, nosepiece disc or objective turret)
- the intermediate mounting bracket (nosepiece holder).

In both microscope models, the Carl Zeiss Jena Jenalumar and the Carl Zeiss Jena Jenaval, the first component - the objective revolver - is identical and interchangeable between the two models. Only the intermediate mounting bracket differs, as it attaches the revolver to the microscope arm. In other words, the nosepiece holder used in the Carl Zeiss Jena Jenalumar microscope is different from the one used in the Carl Zeiss Jena Jenaval microscope, but both holders have exactly the same objective revolver attached to them.

This offer includes only the objective turret, without the mounting bracket.

The gallery contains photographs of a Carl Zeiss Jena Jenalumar microscope arm, with the objective nosepiece indicated by an arrow to clearly show its location. It also includes photographs of the complete module consisting of the objective revolver and its holder for the Jenalumar microscope, making it clear how these two components are connected.

This database also contains, under item number 99388, the complete objective nosepiece module with its holder for the Carl Zeiss Jena Jenaval microscope.

Description of this part for the microscope.

knobs (via a pinion mounted on the shaft between the knobs) into the vertical movement of the integrated microscope stage and condenser support. This support is mounted on a dovetail guide, which is an integral part of the focusing block (included with this assembly).

This mechanism is suitable for the following microscope models:
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Jenaval
- Carl Zeiss Jena Jenavert

Description of this part for the microscope.

objective nosepiece and the microscope arm. In the Carl Zeiss Jena Jenalumar microscope, a fluorescence filter cube slides into position above the objective revolver. Inside this holder there is a longitudinal dovetail guide along which the fluorescence filter cubes slide. It also contains a spring steel detent that provides a distinct "click" to indicate the filter position as the fluorescence filter cube is moved along the dovetail guide.

The objective revolver is attached to this holder with screws, and the complete assembly consisting of the holder and objective turret is then screwed to the microscope arm.

The complete objective nosepiece module for Carl Zeiss Jena Jenalumar or Jenaval microscopes consists of:
- the objective revolver (also called the objective nosepiece, nosepiece disc or objective turret)
- the intermediate mounting bracket (nosepiece holder).

In both microscope models, the Carl Zeiss Jena Jenalumar and the Carl Zeiss Jena Jenaval, the first component - the objective revolver - is identical and interchangeable between the two models. Only the intermediate mounting bracket differs, as it attaches the revolver to the microscope arm. In other words, the nosepiece holder used in the Carl Zeiss Jena Jenalumar microscope is different from the one used in the Carl Zeiss Jena Jenaval microscope, but both holders have exactly the same objective revolvers attached to them.

This listing includes only the intermediate holder for the Carl Zeiss Jena Jenalumar model, without the objective nosepiece.

Interestingly, this component is made of aluminium, whereas the corresponding component performing the same function in the Carl Zeiss Jena Jenaval microscope is manufactured from a ZnAl alloy. Cast or injection-moulded ZnAl components made by Carl Zeiss Jena carry identification numbers that allow them to be identified. In the Jenaval microscope this number is 2643 (full marking: Si10 CZ 2643). The objective nosepiece holder used in the Jenalumar does not carry such a number.

Another useful piece of information is that the sliding fluorescence filter cube from the Carl Zeiss Jena Jenamed Fluorescence microscope fits the dovetail guide incorporated into this nosepiece holder.

The gallery includes photographs of the complete assembly consisting of the objective nosepiece and its holder for the Jenalumar microscope, making it clear how these two components are connected.

This database also contains, under item number 99678, the separate objective revolver without the holder.

Description of this part for the microscope.

The complete set presented here consists of three components:
1. a small metal plate marked with the numbers 1 to 8 - these identify the terminal positions
2. an electrical tab terminal strip with eight terminals, housed in a plastic body
3. the rear sheet-metal cover of the microscope arm with the printed 6V illumination wiring diagram

This set was removed from a Carl Zeiss Jena Jenalumar microscope.

Components "1" and "2" (the numbered plate and the electrical tab terminal strip) are universal and fit the following microscope models:
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Jenaval
- Carl Zeiss Jena Jenavert
- Carl Zeiss Jena Jenapol

Component "3" (the rear sheet-metal cover of the microscope arm)
- fits the Carl Zeiss Jena Jenalumar microscope
- does not fit the Carl Zeiss Jena Jenaval microscope
- I do not know whether it fits the Carl Zeiss Jena Jenavert or Jenapol microscopes, as I have not personally tested this.

The 6V supply wires coming from the power supply are connected to the input terminals on the underside of this electrical tab terminal strip. The power supply is built into the microscope base. The lampenhaus fitted with a 6V 25W halogen bulb is connected to the output terminals on the upper side. In the Carl Zeiss Jena Jenaval and Jenalumar microscopes this supplies the transmitted-light illuminator. In the Carl Zeiss Jena Jenavert microscope it supplies the reflected-light illuminator.

In microscope versions equipped with two illuminators, only one of them can be powered from the power supply built into the microscope base, because the built-in power supply has a maximum output power of 25 W. The second illuminator requires an external power supply appropriate for the particular light source (a halogen lamp, a fluorescence light source, or - in the case of LED illuminators - an LED power supply with a dimmer).

This database also contains, under item number 99694, the same component together with the rear sheet-metal cover of the microscope arm from a Carl Zeiss Jena Jenaval microscope. You can compare the two versions to see the difference in the size of the rear sheet-metal cover between the Carl Zeiss Jena Jenaval and Jenalumar models.

If you need only one component from this set - either the rear microscope arm cover or only the electrical tab terminal strip - please contact us by email or through social media.

Description of this part for the microscope.

It is not an illuminator holder in the literal sense. The illuminator is secured with screws to the sides of the microscope's vertical arm. Instead, the central circular opening in this component is designed to receive and accurately position the cylindrical light-output section of the illuminator (lamphouse).

Microscopes designed for reflected-light operation (either exclusively or in addition to transmitted light), such as the Carl Zeiss Jena Jenalumar, Jenavert and Jenapol-U, have a different upper horizontal microscope arm from models intended exclusively for transmitted light, such as the Carl Zeiss Jena Jenaval. The reflected-light arm includes a slot for filter sliders, a slot for an aperture slider and, of course, an angled mirror.

Interestingly, this component is also present in Carl Zeiss Jena Jenaval microscopes, even though the standard version of this model is not equipped with an EPI reflected-light illuminator. Since it is not used there, it is normally covered by the rear sheet-metal cover of the microscope arm. This is exactly why the rear cover of the Carl Zeiss Jena Jenalumar microscope is shorter than that of the Jenaval model - it does not have to cover this component (see item no. 99679 in this database).

This component fits the following microscope models:
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Jenaval
- Carl Zeiss Jena Jenavert
- Carl Zeiss Jena Jenapol

- in the Carl Zeiss Jena Jenaval microscope this component is hidden behind the rear sheet-metal cover and is not used
- in the Carl Zeiss Jena Jenalumar 50 this component receives the small 50W HBO fluorescence illuminator
- in the Carl Zeiss Jena Jenalumar 250 with the large integrated lamphouse, this component receives the light-output section of the 250W HBO fluorescence illuminator
- in the Carl Zeiss Jena Jenavert this component receives the 50W/100W halogen illuminator
- Carl Zeiss Jena Jenapol microscopes may be equipped with various EPI reflected-light illuminators

Cast or injection-moulded ZnAl components manufactured by Carl Zeiss Jena carry identification numbers that allow them to be identified. This component bears the number 2650 (full marking: Si10 2650).

Description of this part for the microscope.

This filter is mounted in the sheet-metal housing of the large HBO 250W fluorescence illuminator. This illuminator is part of a large mirror light beam splitter used in Carl Zeiss Jena Jenalumar microscopes. The KG filter is designed to absorb heat (infrared radiation) emitted by the high-pressure HBO mercury lamp.

Please note that there is also a version of the Carl Zeiss Jena Jenalumar microscopes with a small 50W HBO illuminator. This KG filter glass was removed from a large 250W illuminator.

On the used market, in microscopy forums and in microscopy groups, several names are used for this filter, all referring to the same type of filter:
- KG filter / KG glass
- heat filter
- heat absorbing filter
- heat absorption filter
- heat-absorbing glass
- heat absorption glass
- absorption filter
- IR filter
- infrared blocking filter
- infrared cut filter
- KG3 heat absorption filter

This microscope element is highly susceptible to damage. When this happens, the filter needs to be replaced, for example with the filter presented here. Here are examples of damage that can occur during use of the fluorescence illuminator and reasons why replacement of the filter may be necessary:
- the KG filter may crack or become cloudy due to overheating
- the filter may also chip or break as a result of mechanical damage, for example during transport
- the filter may sometimes be damaged during improper maintenance

High-performance heat filters such as this KG filter used with a 250W lamp are very often used by people building their own DIY projects. The housing with screw mounting makes this particularly convenient.

The last photo in the gallery shows the housing of the HBO 250W illuminator (lampenhaus), with an arrow indicating which element is being described and where it is located inside the illuminator. This makes it possible to identify the element unambiguously.

Description of this part for the microscope.

susceptible to damage, and good and efficient passive cooling is very important in an HBO 250W illuminator.

In Carl Zeiss Jena Jenalumar microscopes, the large HBO 250W fluorescence illuminator is attached to the Spiegelhaus for light beam splitting. It has two such heat sinks - one at the bottom and one at the top of the lamp housing.

For certainty, the photo gallery shows the exact dimensions of this element. The last photo shows the complete illuminator from which this element was removed, allowing the compatibility to be confirmed with certainty.

Description of this part for the microscope.

fluorescence illuminator behind the high-pressure mercury burner. In Carl Zeiss Jena Jenalumar microscopes, the large HBO 250W fluorescence illuminator is attached to the Spiegelhaus for light beam splitting.

The function of this element is to collect and reflect toward the KG filter the light that "shines and escapes to the rear".

This mirror, located directly next to the light source, is susceptible to damage, among other things due to exposure to high temperatures. Additionally, when the high-pressure mercury burner explodes (which occasionally happens), the mirror is very often damaged by the explosion.

The photo gallery shows the exact dimensions of this element. The last photo shows the HBO 250W illuminator for a Carl Zeiss Jena Jenalumar microscope, allowing the compatibility to be confirmed with certainty.

Description of this part for the microscope.

here is not a standalone lamp housing (such as part number 99693 in this database). It is an internal component of the large, integrated illuminator used in Carl Zeiss Jena Jenalumar 250 microscopes.

Carl Zeiss Jena Jenalumar microscopes are available in two main versions:
1. with two small illuminators - with a separate 6 V 25 W halogen illuminator in a small housing (for transmitted light) and a separate HBO 50 W fluorescence illuminator in a small housing (for reflected light)
2. with a large, integrated module consisting of a mirror light splitter, an integrated transmitted-light module with a 6 V 25 W halogen lamp, and a large lamp housing for HBO 250 W fluorescence illumination

The component offered here is part of the second version of the Jenalumar microscope.

Basic parameters of this illuminator module:
Supported lamp: Narva HLWS 6 V 25 W halogen lamp
6 V power connection: this illuminator is connected to the distributor rail (see part number 99679 in this database)
Cooling: passive, in two ways. The Narva HLWS lamp has integrated cooling in the form of "wings", while the entire illuminator is covered with a cover incorporating a finned heat sink (this is a separate component and is not part of the illuminator offered here)

The photo gallery shows the exact dimensions of this component. The last photo shows the complete HBO 250 W illuminator for the Carl Zeiss Jena Jenalumar microscope, with an arrow indicating this halogen illuminator module. This makes it possible to identify exactly where this component is located within the complete large microscope illuminator.

Description of this part for the microscope.

17-A
Magnification: 50x
Numerical aperture N.A.: 0.95
Optical correction: Apochromat
Additionally: cover glass thickness correction collar, range 0.12 - 0.22 mm
Tube length: infinity
Thread: M25
Cover glass: yes, required
Immersion: no (so-called dry objective)

Commonly used, cheap cover glasses are 0.17 mm thick mostly on paper. Even the standard for class #1.5 allows a range of 0.16-0.19 mm, and cheap Chinese cover glasses in practice come in anywhere from approx. 0.13 to 0.25 mm, often not matching the thickness stated on the box. Only #1.5H (high precision) cover glasses have a guaranteed thickness of 0.170 mm with a tolerance of +/- 0.005 mm. With high-aperture dry objectives such as this Apochromat 50x/0.95, variation in cover glass thickness noticeably reduces image contrast and resolution (spherical aberration). The correction collar fitted to this objective lets you adjust the optics to the combined thickness of the cover glass and the mounting medium layer beneath it, within a range of 0.12 mm to 0.22 mm. This compensates for most of the variation encountered in practice.

This objective fits, among others, the following microscopes:
- Carl Zeiss Jena Jenamed
- Carl Zeiss Jena Jenalab
- Carl Zeiss Jena Jenaval
- Carl Zeiss Jena Jenalumar

As for the Carl Zeiss Jena Jenamed microscope, this objective fits every variant:
- Carl Zeiss Jena Jenamed variant
- Carl Zeiss Jena Jenamed Fluorescence
- Carl Zeiss Jena Jenamed hematology
- Carl Zeiss Jena Jenamed cytology
- Carl Zeiss Jena Jenamed 2

Description of this part for the microscope.

Carl Zeiss Jena
Model: KP425
Type: interference excitation filter for fluorescence
Diameter: 32 mm
Mirror coating: yes

Filters 32 mm in diameter can be used in most microscopes from many manufacturers. In Carl Zeiss Jena microscopes they can be used, among others, in the following fluorescence microscopes:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Note - because this is an interference filter (it has a mirrored surface), the angle at which the filter sits relative to the incoming light matters and affects its parameters.

The coating on interference filters is sensitive not only to mechanical damage, for example scratches from improper storage or cleaning. Several decades of work right next to the HBO lamp can cloud it or make it delaminate, which shows as patches or rainbow islands that do not disappear when you rotate it. In that case the best solution is to replace the filter with one like the one I offer here.

Description of this part for the microscope.

Carl Zeiss Jena
Model: KP490
Type: interference excitation filter for fluorescence
Diameter: 32 mm
Mirror coating: yes

Filters 32 mm in diameter can be used in most microscopes from many manufacturers. In Carl Zeiss Jena microscopes they can be used, among others, in the following fluorescence microscopes:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Note - this is an interference filter, which you can tell from the mirrored surface. For that reason the angle at which the filter sits relative to the incoming light matters and affects its parameters.

The coating on interference filters is sensitive to mechanical damage, for example scratches from improper storage or cleaning. Age is a separate matter - several decades of work right next to the HBO lamp can cloud it or make it delaminate, which shows as patches or rainbow islands that do not disappear when you rotate it. In that case the best solution is to replace the filter with one like the one I offer here.

Description of this part for the microscope.

Carl Zeiss Jena
Model: KP560
Type: interference excitation filter for fluorescence
Diameter: 32 mm
Mirror coating: yes

Filters 32 mm in diameter can be used in most microscopes from many manufacturers. In Carl Zeiss Jena microscopes they can be used, among others, in the following fluorescence microscopes:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval
- Carl Zeiss Jena Laboval Fluorescence

Note - the mirrored surface gives away that this is an interference filter. With filters of this kind the angle to the incoming light is not indifferent and affects their parameters.

The coating on interference filters is sensitive to mechanical damage, for example scratches from improper storage or cleaning. The second enemy is time - several decades of work right next to the HBO lamp can cloud it or make it delaminate, which shows as patches or rainbow islands that do not disappear when you rotate it. In that case the best solution is to replace the filter with one like the one I offer here.

Description of this part for the microscope.

Carl Zeiss Jena
Model: B226g
Filter type: red-absorbing glass filter (the manufacturer calls it Rotsperrfilter)
Diameter: 32 mm
Colour: blue
Toughened version: yes

The letter "g" at the end of the designation is short for the German gehärtet, meaning toughened - the manufacturer gave it to filters meant to work right next to high-power lamps, especially HBO mercury burners, where ordinary glass does not withstand the high temperature.

Filters 32 mm in diameter can be used in most microscopes from many manufacturers. In Carl Zeiss Jena microscopes they can be used, among others, in the following fluorescence microscopes:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval / Fluoval-2
- Carl Zeiss Jena Laboval Fluorescence

In the excitation path this filter does not work on its own. It is added to the main filter to cut off the red passed by that filter and to narrow the excitation band further.

Description of this part for the microscope.

Carl Zeiss Jena
Model: B228g
Filter type: red-absorbing glass filter (the manufacturer calls it Rotsperrfilter)
Diameter: 32 mm
Colour: blue
Toughened version: yes

The "g" at the end of the designation stands for the German gehärtet, meaning toughened. The manufacturer gave it to filters meant to work right next to high-power lamps, especially HBO mercury burners, where ordinary glass does not withstand the high temperature.

Filters 32 mm in diameter can be used in most microscopes from many manufacturers. In Carl Zeiss Jena microscopes they can be used, among others, in the following fluorescence microscopes:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval / Fluoval-2
- Carl Zeiss Jena Laboval Fluorescence

In the excitation path this filter does not work on its own. It is added to the main filter to cut off the red that filter passes and to narrow the excitation band further.

Description of this part for the microscope.

Carl Zeiss Jena
Model: B229g
Filter type: red-absorbing glass filter (the manufacturer calls it Rotsperrfilter)
Diameter: 32 mm
Colour: blue
Toughened version: yes

The "g" at the end of the designation stands for the German gehärtet, meaning toughened. The manufacturer gave it to filters meant to work right next to high-power lamps, especially HBO mercury burners, where ordinary glass does not withstand the high temperature.

Filters 32 mm in diameter can be used in most microscopes from many manufacturers. In Carl Zeiss Jena microscopes they can be used, among others, in the following fluorescence microscopes:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval / Fluoval-2
- Carl Zeiss Jena Laboval Fluorescence

In the excitation path this filter does not work on its own. It is added to the main filter to cut off the red that filter passes and to narrow the excitation band further.

Description of this part for the microscope.

filter:
Manufacturer: Carl Zeiss Jena
Model: U204g
Filter type: glass excitation filter for UV fluorescence (the manufacturer calls it Erregerfilter)
Glass type: UG 1
Diameter: 32 mm
Thickness: 2 mm
Colour: black-violet, passes very little visible light
Toughened version: yes

The g at the end of the designation stands for the German gehärtet, meaning toughened. The manufacturer gave it to filters meant to work right next to high-power lamps, especially HBO mercury burners, where ordinary glass does not withstand the high temperature. With a UV excitation filter this matters especially, because it sits at the hottest point of the whole path and absorbs most of the burner energy.

Filters 32 mm in diameter can be used in most microscopes from many manufacturers. In Carl Zeiss Jena microscopes they can be used, among others, in the following fluorescence microscopes:
- Carl Zeiss Jena Jenamed Fluorescence (Fluoreszenz)
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Fluoval / Fluoval-2
- Carl Zeiss Jena Laboval Fluorescence

The manufacturer catalogue gives the following transmission values for this glass at 2 mm thickness:
- 0.015 at 302 nm
- 0.093 at 312 nm
- 0.435 at 334 nm
- 0.644 at 366 nm

Across the whole visible range, from 405 to 644 nm, transmission is zero. This means the filter works almost entirely on the 366 nm mercury line, exactly where the HBO burner is strongest in the ultraviolet.

One property of this glass is worth knowing: above 700 nm it starts to transmit again, and at 750 nm transmission reaches 0.210. This infrared leak is invisible to the eye, but it heats the specimen and spoils contrast in photographs.

In the excitation path U204 is also combined with a red-absorbing filter. The manufacturer documentation shows such a pair with the B226 filter, which cleans up the excitation band further.

The same UG 1 glass was supplied in two thicknesses, each with its own designation:
- The Carl Zeiss Jena U204 filter is UG 1 glass 2 mm thick
- The Carl Zeiss Jena U205 filter is UG 1 glass 4 mm thick

The thicker U205 cuts more sharply, but passes about a third less energy on the 366 nm line, so the image is noticeably darker.

A safety note: this filter passes ultraviolet, which is invisible and harmful to the eyes. When working with it, never look into the illumination path without a barrier filter in place.

Description of this part for the microscope.

following microscopes:
- Carl Zeiss Jena Jenaval
- Carl Zeiss Jena Jenalumar
- Carl Zeiss Jena Jenapol
- Carl Zeiss Jena Jenavert

Each of these discs has 5 seats that take filters of 32 mm diameter. The filters are locked in place by a springy retaining ring (a so-called Sprengring) so that they cannot fall out. The set offered here comes with 10 such rings. Since each wheel can be loaded with five filters, the total number of possible combinations is 25.

At the moment these filter seats are empty. Neither wheel has any filters fitted - you are free to load them with whatever filters you like.

This two-wheel module fits halogen, HBO and XBO lamphouses.

Parts made by Carl Zeiss Jena, cast or injection moulded from ZnAl alloy, carry their own numbers by which they can be identified. This double filter revolver module consists of 3 cast components:
- 2672 Si10 CZ - the frame carrying both wheels. It is at the same time the outer cover plate with which the whole module is screwed onto the lamphouse
- 2957 Si10 CZ - the thick filter wheel
- and note: the thin filter wheel also carries the number 2957 Si10 CZ, which is unusual for this manufacturer - that two parts differing in dimensions should share the same number

This double filter wheel is sometimes also called:
- double filter holder
- double filter turret
- dual filter carrier
- double filter slider
- double filter changer

Here https://www.microscopeparts.eu/part/99693 you can see what a complete 6V 25W halogen illuminator looks like with a single filter wheel fitted. The double set offered here fits such an illuminator among others, so the single filter wheel from the illuminator of a Carl Zeiss Jena Jenaval microscope can, for example, be replaced by the double one.