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Description of this part for the microscope.

This objective is manufactured by Will Wetzlar - they are the same objective, differing only in the engraved name.

Perfect exterior and optics. Finding a lens in this condition on the used market is difficult.

Manufacturer: CBS Beck Kassel (Will Wetzlar)
Magnification: 10x
Color correction: achromat
Numerical aperture: 0.30
Tube length: 160 mm
Focal length: 37 mm
Cover glass: no
Immersion: no
Thread: RMS

Description of this part for the microscope.

This objective is manufactured by Will Wetzlar - they are the same objective, differing only in the engraved name.

Perfect exterior and optics. Finding a lens in this condition on the used market is difficult.

Manufacturer: CBS Beck Kassel (Will Wetzlar)
Magnification: 5x
Color correction: achromat
Numerical aperture: 0.10
Tube length: 160 mm
Focal length: 37 mm
Cover glass: no
Immersion: no
Thread: RMS

Description of this part for the microscope.

engraved name.

Perfect exterior and optics. Finding a lens in this condition on the used market is difficult.

Manufacturer: CBS Beck Kassel (Will Wetzlar)
Magnification: 40x
Color correction: achromat
Numerical aperture: 0.65
Tube length: 160 mm
Focal length: 37 mm
Cover glass: 0,17 mm
Immersion: no
Thread: RMS

Description of this part for the microscope.

market.

Manufacturer: Will Wetzlar (engraved with Wetzlar Optik)
Magnification: 100x
Model: 100:1 Oil N.A. 1.30
Numerical aperture: 1.30
Tube length: Not certain, probably 170 mm
Focal length: 37 mm
Cover glass: 0.17 mm
Immersion: Yes, oil immersion
Thread: RMS

The microscope lenses engraved with the name "Wetzlar Optik" were manufactured by Will Wetzlar for other microscope manufacturers. The aim was to provide other manufacturers with access to optics of the highest quality and to increase the value of their products by using the name "Wetzlar" (Leica), which stands for optical glass of the highest quality.

Description of this part for the microscope.

Wetzlar)
Magnification: 10x
Color correction: achromat
Numerical aperture: 0.25
Tube length: 160 mm
Focal length: 37 mm
Cover glass: no
Immersion: no
Thread: RMS

Description of this part for the microscope.

differing only in the engraved name.

Manufacturer: CBS Beck Kassel (Will Wetzlar)
Model: Ph 10x/0,30 160
Magnification: 10x
Color correction: achromat
Numerical aperture: 0.30
Tube length: 160 mm
Focal length: 37 mm
Cover glass: no
Immersion: no
Thread: RMS
Info: Ph = Phase Contrast

Description of this part for the microscope.

Manufacturer: CBS Beck Kassel (Will Wetzlar)
Magnification: 43x
Color correction: achromat
Numerical aperture: 0.65
Tube length: ?
Focal length: 37 mm
Cover glass: 0,17 mm
Immersion: no
Thread: RMS

Description of this part for the microscope.

40
Magnification: 20x
Correction: Achromat
Numerical Aperture: 0.40
Tube Length: 170 mm
Focal Length: 37 mm
Cover Glass: No
Immersion: No
Thread: RMS

Interestingly, despite its 20x magnification, this microscope objective is marked as requiring no coverslip.

Objective lens of excellent optical quality.

Currently, Kosmos Stuttgart sells plastic educational microscopes for children imported from China.
High-quality optical microscopes were once sold under this brand (or Humboldt), primarily those manufactured at the Hertel & Reuss factory in Kassel.

Description of this part for the microscope.

30
Magnification: 10x
Correction: Achromat
Numerical Aperture: 0.30
Tube Length: 170 mm
Focal Length: 37 mm
Cover Glass: No
Immersion: No
Thread: RMS

Objective lens of excellent optical quality.

Currently, Kosmos Stuttgart sells plastic educational microscopes for children imported from China.
High-quality optical microscopes were once sold under this brand (or Humboldt), primarily those manufactured at the Hertel & Reuss factory in Kassel.

Description of this part for the microscope.

55
Magnification: 30x
Correction: Achromat
Numerical Aperture: 0.55
Tube Length: 170 mm
Focal Length: 37 mm
Cover Glass: No
Immersion: No
Thread: RMS

Interestingly, despite its 30x magnification, this microscope objective is marked as requiring no coverslip.

Objective lens of excellent optical quality.

Currently, Kosmos Stuttgart sells plastic educational microscopes for children imported from China.
High-quality optical microscopes were once sold under this brand (or Humboldt), primarily those manufactured at the Hertel & Reuss factory in Kassel.

Description of this part for the microscope.

85
Magnification: 63x
Correction: Achromat
Numerical Aperture: 0.85
Tube Length: 170 mm
Focal Length: 37 mm
Cover Glass: Yes, 0.17 mm
Immersion: No (dry)
Thread: RMS

Objective lens of excellent optical quality.

Currently, Kosmos Stuttgart sells plastic educational microscopes for children imported from China.
High-quality optical microscopes were once sold under this brand (or Humboldt), primarily those manufactured at the Hertel & Reuss factory in Kassel.

Description of this part for the microscope.

Beck Kassel (Will Wetzlar)
Magnification: 100x
Model: Oel 100/1,25 160/0,17
Numerical aperture: 1.25
Tube length: 160 mm
Focal length: 37 mm
Cover glass: 0.17 mm
Immersion: yes, oil
Thread: RMS

Description of this part for the microscope.

10
Cover glass: not required
Thread: RMS
Tube length: 160 mm
Focal length: 37 mm
Immersion: no (dry objective)
Thread: RMS

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

This is a version of the objective with the markings engraved on the housing rather than merely applied with paint (printed). This is important in terms of the durability of the markings - printed markings (without engraving) very often wear off, in which case the objective parameters are no longer visible.

The companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel, Kosmos Stuttgart and Hund Wetzlar also used objectives manufactured by Will Wetzlar, although their own manufacturer name was often printed on the objectives. It can therefore be said with a high degree of confidence that this objective will fit microscopes from these companies - but it is worth checking the parfocal length first (37 mm or 45 mm).

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives designed for TL = 160 mm and with a parfocal length of 37 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.

25
Cover glass: not required
Thread: RMS
Tube length: 160 mm
Focal length: 37 mm
Immersion: no (dry objective)
Thread: RMS

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

This is a version of the objective with the markings engraved on the housing rather than merely applied with paint (printed). This is important in terms of the durability of the markings - printed markings (without engraving) very often wear off, in which case the objective parameters are no longer visible.

The companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel, Kosmos Stuttgart and Hund Wetzlar also used objectives manufactured by Will Wetzlar, although their own manufacturer name was often printed on the objectives. It can therefore be said with a high degree of confidence that this objective will fit microscopes from these companies - but it is worth checking the parfocal length first (37 mm or 45 mm).

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives designed for TL = 160 mm and with a parfocal length of 37 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.

65
Cover glass: yes, 0.17 mm
Thread: RMS
Tube length: 160 mm
Focal length: 37 mm
Immersion: no (dry objective)
Thread: RMS

This is a version of the objective with the markings engraved on the housing rather than merely applied with paint (printed). This is important in terms of the durability of the markings - printed markings (without engraving) very often wear off, in which case the objective parameters are no longer visible.

The companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel, Kosmos Stuttgart and Hund Wetzlar also used objectives manufactured by Will Wetzlar, although their own manufacturer name was often printed on the objectives. It can therefore be said with a high degree of confidence that this objective will fit microscopes from these companies - but it is worth checking the parfocal length first (37 mm or 45 mm).

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives designed for TL = 160 mm and with a parfocal length of 37 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.

10 160/-
Numerical aperture N.A.: 0.10
Cover glass: not required
Thread: RMS
Tube length: 160 mm
Parfocal distance: 45 mm (so-called long objective)
Immersion: no (dry objective)

This objective can be used:
- on biological transmitted light microscopes
- on inverted microscopes
- on microscopes with a reflected light illuminator
- for macro photography, connected directly to a camera

This is the so-called black series of objectives, named after the black plastic objective barrel. They were used mainly in the Will Wetzlar microscopes of the V300 series, for example in the Wilozyt V365 model. This was the period when manufacturers were experimenting with a new look for microscope parts, and exactly the same black series appeared, for example, in the Leitz Wetzlar HM-LUX-3 microscopes.

It is worth noting that the Will Wetzlar microscopes of the V100 and V200 series were usually fitted with objectives of 37 mm parfocal distance - but newer objectives with a parfocal distance of 45 mm, such as those of the black series, can be used in them without any problems whatsoever.

The companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel, Kosmos Stuttgart and Hund Wetzlar also used objectives made by Will Wetzlar, although these often carried their own company name. It can therefore be said with a high degree of confidence that this objective will also fit the microscopes of those companies.

This objective fits practically any microscope of any make, provided it has an RMS thread and accepts objectives with TL=160 mm and parfocal distances of 33 / 37 and 45 mm. A few examples of such microscopes are listed in the "kompatybilność" section, but that list is not exhaustive.

Description of this part for the microscope.

25 160/0.17
Numerical aperture N.A.: 1.25
Cover glass: yes, 0.17 mm
Thread: RMS
Tube length: 160 mm
Parfocal distance: 45 mm (so-called long barrel)
Immersion: yes, oil immersion

This objective can be used:
- on biological transmitted light microscopes
- on inverted microscopes
- on microscopes with a reflected light illuminator
- for macro photography, connected directly to a camera

This is the so-called black series of objectives, named after the black plastic objective barrel. They were used mainly in the Will Wetzlar microscopes of the V300 series, for example in the Wilozyt V365 model. This was the period when manufacturers were experimenting with a new look for microscope parts, and exactly the same black series appeared, for example, in the Leitz Wetzlar HM-LUX-3 microscopes.

It is worth noting that the Will Wetzlar microscopes of the V100 and V200 series were usually fitted with objectives of 37 mm parfocal distance - but newer objectives with a parfocal distance of 45 mm, such as those of the black series, can be used in them without any problems whatsoever.

The companies Eschenbach, Kremp Wetzlar, CBS Beck Kassel, Kosmos Stuttgart and Hund Wetzlar also used objectives made by Will Wetzlar, although these often carried their own company name. It can therefore be said with a high degree of confidence that this objective will also fit the microscopes of those companies.

This objective fits practically any microscope of any make, provided it has an RMS thread and accepts objectives with TL=160 mm and parfocal distances of 33 / 37 and 45 mm. A few examples of such microscopes are listed in the "kompatybilność" section, but that list is not exhaustive.

Description of this part for the microscope.

objective, and its technical specifications are described below. However, this particular example may be of interest to collectors of microscope equipment.

The objective is designed for a tube length (TL) of 160 mm and corrected for use with a 0.17 mm thick cover glass. The engraving on the objective barrel should therefore read:

160/0.17

but the metal barrel is engraved:

0/0.17 - meaning the two leading digits, "1" and "6", are missing.

This is not a painted marking that has worn off, which is very common. It is a machine engraving that was defective straight from the factory.

Manufacturer: Will Wetzlar
Magnification: 100x
Model: 160/0.17 Oel 100/1.25
Actual engraving: 0/0.17 Oel 100/1.25
Type of error: incomplete engraving of the specifications on the barrel
Numerical aperture N.A.: 1.25
Cover glass: yes, 0.17 mm
Thread: RMS
Tube length: 160 mm
Parfocal length: 37 mm
Immersion: yes, oil

Eschenbach, Kremp Wetzlar, CBS Beck Kassel, Kosmos Stuttgart and Hund Wetzlar also used objectives made by Will Wetzlar, although these often carried their own brand name. It is therefore quite safe to say that this objective will fit microscopes from these companies - but it is worth checking the parfocal length first (37 mm or 45 mm).

This objective fits practically any microscope from any manufacturer, as long as it has an RMS thread and accepts objectives with TL=160 mm and a parfocal length of 37 mm. Some example microscopes are listed in the "compatibility" section, but the list is not exhaustive.

Description of this part for the microscope.

17 100/1.25 Oel
Catalogue number in the manufacturer's catalogue: 519756
Numerical aperture N.A.: 1.25
Cover glass: yes, 0.17 mm
Thread: RMS
Tube length: 160 mm
Parfocal length: 45 mm (so-called long barrel objective)
Immersion: yes, oil

This is the so-called "black series" of objectives, named after the black plastic housing of the objective. They were used mainly in Leitz Wetzlar HM-LUX-3 microscopes (and in the model signed Leica HM-LUX 3). This was the period when manufacturers were experimenting with a new look for microscope parts, and exactly the same kind of "black series" could also be found in Will Wetzlar V300 / V355 / V365 or Nikon Alphaphot YS2 microscopes.

This objective fits practically any microscope from any manufacturer, provided it has an RMS thread and accepts objectives with a tube length of 160 mm and a parfocal length of 33 / 37 or 45 mm. A few such microscopes are listed as examples in the "compatibility" section, but this is not a complete list.

Description of this part for the microscope.

25
Catalogue number in the manufacturer's catalogue: 519754
Numerical aperture N.A.: 0.25
Cover glass: not required
Thread: RMS
Tube length: 160 mm
Parfocal length: 45 mm (so-called long barrel objective)
Immersion: no (dry objective)

This is the so-called "black series" of objectives, named after the black plastic housing of the objective. They were used mainly in Leitz Wetzlar HM-LUX-3 microscopes (and in the model signed Leica HM-LUX 3). This was the period when manufacturers were experimenting with a new look for microscope parts, and exactly the same kind of "black series" could also be found in Will Wetzlar V300 / V355 / V365 or Nikon Alphaphot YS2 microscopes.

From 1990 onwards, the logo (and the name) "Leica" began to appear on microscopes that had until then been signed "Leitz". This was also visible on the HM-LUX 3 microscope - and this microscope can be found both with the "Leitz" logo and with "Leica". The same 10x objective that I present here with the name "Leitz Wetzlar" and manufacturer number 519754 also exists with the "Leica" marking - and NOTE - it carries exactly the same number, that is "519754".

This objective fits practically any microscope from any manufacturer, provided it has an RMS thread and accepts objectives with a tube length of 160 mm and a parfocal length of 33 / 37 or 45 mm. A few such microscopes are listed as examples in the "compatibility" section, but this is not a complete list.

Description of this part for the microscope.

achromatic
Numerical aperture N.A.: 0.30
Tube length: 170 mm
Parfocal length: 37 mm
Cover glass: yes, 0.17 mm thick
Immersion: no (dry objective)
Thread: RMS

The Steindorff 10x objective is also suitable for macro photography, as it does not require a cover glass and allows direct projection onto the camera sensor without intermediate optics.

This is a so-called "short objective", with a parfocal length of 37 mm. It is particularly common to mount this objective on an 8 mm extension, which makes it possible to use the objective in microscopes requiring objectives with a parfocal length of 45 mm. Both professional adapters with protective optics and metal adapters, as well as popular DIY solutions made with a 3D printer, work well for this purpose.

Like a large proportion of microscope objectives manufactured in Germany in the 1960s and 1970s, this objective has a parfocal length of 37 mm and a tube length of 170 mm. This means that it is often used as a replacement objective for other German microscopes, such as:
- Leitz Wetzlar
- Kremp Wetzlar
- Hertel & Reuss
- Steinmar Berlin
- CBS Beck Kassel
- ROW Rathenow

This objective fits practically any microscope from any manufacturer, provided that it has an RMS thread and supports objectives designed for TL = 170 mm and with a parfocal length of 33 / 37 mm (or 45 mm when using a suitable adapter). 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.

the manufacturer's 1967 catalog: 519 237 (alternative notation: 519237)
Numerical aperture N.A.: 0.40
Tube length: 170 mm
Parfocal length: 37 mm
Working distance: 3.4 mm
Cover glass: either - the objective works both without and with a cover glass
Immersion: no (dry objective)
Thread: RMS

Because it works without a cover glass and has a high numerical aperture N.A., this objective can be attractive for macro photographers. It allows projection directly onto the camera sensor - without any intermediate optics.

This objective was removed from a Leitz SM microscope, but it fits most Leitz Wetzlar microscopes made before roughly 1980 (SM, SM-D, SM-Lux, Dialux, Ortholux, Orthoplan, etc.).

Some useful information about Leitz Wetzlar objectives with TL=170 mm and 37 mm parfocal length:
- most Leitz microscopes made before roughly 1980 accept objectives for both 160 mm and 170 mm tube length
- many Leitz microscopes accept objectives with both 37 mm and 45 mm parfocal length
- with an 8 mm RMS extension adapter, such an objective gets a parfocal length of 45 mm. Leitz made such adapters under the name "Plezy" - but many users make their own, from metal or on 3D printers

Like a large share of microscope objectives made in Germany in the 1960s and 1970s, this objective has a 37 mm parfocal length and a 170 mm tube length. For this reason it is often used as a replacement objective for other German microscopes, e.g.:
- Steindorff Berlin
- Kremp Wetzlar
- Hertel & Reuss
- Steinmar Berlin
- CBS Beck Kassel
- ROW Rathenow

This objective fits practically any microscope from any manufacturer, as long as it has an RMS thread and accepts objectives with TL=170 mm and a parfocal length of 33 / 37 mm (or 45 mm with a suitable adapter). Some examples of such microscopes are listed in the "compatibility" section, but this list is not complete.