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Description of this part for the microscope.

mechanical design.

This is the spherical rear reflector mounted inside the fluorescence illuminator behind the lamp. Its function is to collect and reflect the light that is emitted backwards and would otherwise be lost, directing it towards the collimating lens.

This particular reflector was removed from a fluorescence illuminator used on a Nikon Optiphot microscope. Hg 100W / HBO 100W illuminators of this type, or mechanically identical versions using the same rear reflector, were fitted to, among others:
- Nikon Optiphot
- Nikon Labophot
- Nikon Microphot

Therefore, the reflector presented here is also compatible with these microscopes. However, it should primarily be regarded as a replacement part for the fluorescence illuminator rather than for a specific microscope model.

When may the rear reflector need to be replaced?
- High-pressure fluorescence lamps used as the light source in these illuminators may explode, damaging the rear reflector and often the collimating lens as well.
- In addition, because the reflector is located immediately next to the light source, it is exposed to very high temperatures and is therefore susceptible to thermal damage.
- Another common issue is oxidation of the reflective surface over the course of decades. When this happens, the reflector loses its optical performance and the entire illuminator produces significantly less light.

Important: Nikon EPI fluorescence illuminators of that period were manufactured in several different lamp house versions. They are most commonly referred to simply as:
- Nikon Hg 100W
- Nikon HBO 100W
- Nikon HBO 100W HG Lamp House
- often the model is Nikon LH-M100CB-1

For confirmation of compatibility, the photo gallery includes precise dimensions of this component. The last photograph also shows the complete illuminator from which this reflector was removed, allowing compatibility to be verified with confidence.

Description of this part for the microscope.

lamp house.

This is the illumination collector lens combined with a heat absorbing filter that absorbs the heat generated by the light source (mercury arc lamp).

This particular collector lens and heat absorbing filter assembly was installed in a fluorescence illuminator used on a Nikon Optiphot microscope. Hg 100W / HBO 100W illuminators, or similar models with the same mechanical design and identical optics, were used in, among others, the following microscopes:
- Nikon Optiphot
- Nikon Labophot
- Nikon Microphot

Therefore, the optical module offered here is also compatible with these microscopes. First and foremost, it is a replacement part for repairing the illuminator rather than a specific microscope.

When may it become necessary to replace the heat absorbing filter or the collector lens that collimates the light beam?
- the high-pressure mercury arc lamps used as the light source in these illuminators may explode, damaging the rear reflector and often also the collimator lens.
- in addition, the collector lens located immediately next to the light source is particularly susceptible to damage due to prolonged exposure to high temperatures.
- another very common failure is that the filter simply cracks because of mechanical damage (although it is mounted without mechanical stress—it is intentionally fitted with slight clearance).

Important: Nikon EPI fluorescence illuminators from that period were manufactured with several different lamp house designs. They are most commonly referred to simply as:
- Nikon Hg 100W
- Nikon HBO 100W
- Nikon HBO 100W HG Lamp House
- often the model is Nikon LH-M100CB-1

For verification, the photo gallery includes precise dimensions of this microscope part. The last photograph also shows the complete illuminator from which this microscope part was removed, allowing compatibility to be confirmed with certainty.

Description of this part for the microscope.

illuminator housing.

This is the finned radiator mounted on the top of the fluorescence illuminator housing.

This particular finned radiator was originally installed in a fluorescence illuminator fitted to a Nikon Optiphot microscope. Hg 100W / HBO 100W fluorescence illuminators, as well as similar versions with the same mechanical design using the same passive finned radiator, were used in, among others, the following microscopes:
- Nikon Optiphot
- Nikon Labophot
- Nikon Microphot

Therefore, this cooling component is also compatible with these microscopes. Above all, it is a replacement part for repairing the fluorescence illuminator rather than a specific microscope.

The relatively fragile fins of this radiator are susceptible to mechanical damage (please note the small chipped area clearly shown in the video). In a fluorescence illuminator using a 100 W high-pressure mercury burner, efficient passive cooling is extremely important.

Important: Nikon EPI fluorescence illuminators from that period were manufactured with several different lamp house designs. They are most commonly referred to simply as:
- Nikon Hg 100W
- Nikon HBO 100W
- Nikon HBO 100W HG Lamp House
- often the model is Nikon LH-M100CB-1

For verification, the photo gallery includes the exact dimensions of this component. The last photograph also shows the complete fluorescence illuminator from which this finned radiator was removed, making it possible to confirm compatibility with complete confidence.

Description of this part for the microscope.

illuminator housing.

This particular mounting screw was part of a fluorescence illuminator installed on a Nikon Optiphot microscope. Hg 100W / HBO 100W fluorescence illuminators, as well as similar versions with the same mechanical design, were used in, among others, the following microscopes:
- Nikon Optiphot
- Nikon Labophot
- Nikon Microphot
- and the EPI fluorescence illuminators used with these microscopes

This mounting screw is frequently exposed to damage because it protrudes beyond the outline of the illuminator housing. As a result, it is often bent or even broken, especially during transport.

Important: Nikon EPI fluorescence illuminators from that period were manufactured with several different lamp house designs. They are most commonly referred to simply as:
- Nikon Hg 100W
- Nikon HBO 100W
- Nikon HBO 100W HG Lamp House
- often the model is Nikon LH-M100CB-1

For verification, the photo gallery includes the exact dimensions of this mounting screw. The last photograph also shows the complete fluorescence illuminator from which it was removed, making it possible to confirm compatibility with complete confidence.

Description of this part for the microscope.

0.17 mm
Thread: RMS
Tube length: 160 mm
Focal length: 45 mm
Immersion: yes, oil immersion
Thread: RMS

Only towards the end of its operations did Hertel & Reuss begin producing microscopes with objectives having a 45 mm focal length. These were the Hertel & Reuss Labopan and Superpan models. Previously, microscopes from this company used objectives with a 37 mm focal length.

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives with TL=160 mm. Several examples of such microscopes are listed in the „Compatibility“ section, but this is not a complete list.

Description of this part for the microscope.

10
Cover glass: not required
Thread: RMS
Tube length: 160 mm
Focal length: 45 mm
Immersion: no (dry objective)
Thread: RMS

This objective can be used both:
- with biological microscopes using transmitted-light illumination
- with inverted microscopes
- with microscopes with reflected-light illumination
- for macro photography by directly connecting it to a camera

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives for TL=160 mm. Several examples of such microscopes are listed in the "compatibility" section, but this is not a complete list.

Several facts are worth emphasizing:
- many Hund Wetzlar microscope models are identical to models sold by Will Wetzlar due to their joint production. For example, the BX300 and Wilovert models even have the same name. Therefore, Hund Wetzlar microscope objectives can also be used with Will Wetzlar microscopes.
- the companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel and Kosmos Stuttgart also used Will Wetzlar objectives, so Hund Wetzlar microscope objectives can also be used with microscopes from these manufacturers – but it is worth checking the focal length first (37 mm or 45 mm)
- objectives with magnifications below 16x (e.g. 4x / 5x or 10x) fit both classic biological microscopes, microscopes with reflected-light illuminators and inverted microscopes.

Description of this part for the microscope.

25
Cover glass: not required
Thread: RMS
Tube length: 160 mm
Focal length: 45 mm
Immersion: no (dry objective)
Thread: RMS

This objective can be used both:
- with biological microscopes using transmitted-light illumination
- with inverted microscopes
- with microscopes with reflected-light illumination
- for macro photography by directly connecting it to a camera

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives for TL=160 mm. Several examples of such microscopes are listed in the "compatibility" section, but this is not a complete list.

Several facts are worth emphasizing:
- many Hund Wetzlar microscope models are identical to models sold by Will Wetzlar due to their joint production. For example, the BX300 and Wilovert models even have the same name. Therefore, Hund Wetzlar microscope objectives can also be used with Will Wetzlar microscopes.
- the companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel and Kosmos Stuttgart also used Will Wetzlar objectives, so Hund Wetzlar microscope objectives can also be used with microscopes from these manufacturers – but it is worth checking the focal length first (37 mm or 45 mm)
- objectives with magnifications below 16x (e.g. 4x / 5x or 10x) fit both classic biological microscopes, microscopes with reflected-light illuminators and inverted microscopes.

Description of this part for the microscope.

65
Cover glass: yes, 0,17 mm
Thread: RMS
Tube length: 160 mm
Focal length: 45 mm
Immersion: no (dry objective)
Thread: RMS

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives for TL=160 mm. Several examples of such microscopes are listed in the "compatibility" section, but this is not a complete list.

- many Hund Wetzlar microscope models are identical to models sold by Will Wetzlar due to their joint production. For example, the BX300 and Wilovert models even have the same name. Therefore, Hund Wetzlar microscope objectives can also be used with Will Wetzlar microscopes.
- the companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel and Kosmos Stuttgart also used Will Wetzlar objectives, so Hund Wetzlar microscope objectives can also be used with microscopes from these manufacturers – but it is worth checking the focal length first (37 mm or 45 mm)

Description of this part for the microscope.

25
Cover glass: yes, 0.17 mm
Thread: RMS
Tube length: 160 mm
Focal length: 45 mm
Immersion: yes, oil immersion
Thread: RMS

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives for TL=160 mm. Several examples of such microscopes are listed in the "compatibility" section, but this is not a complete list.

- many Hund Wetzlar microscope models are identical to models sold by Will Wetzlar due to their joint production. For example, the BX300 and Wilovert models even have the same name. Therefore, Hund Wetzlar microscope objectives can also be used with Will Wetzlar microscopes.
- the companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel and Kosmos Stuttgart also used Will Wetzlar objectives, so Hund Wetzlar microscope objectives can also be used with microscopes from these manufacturers – but it is worth checking the focal length first (37 mm or 45 mm)