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Description of this part for the microscope.

differences between the Lomo MIN-8 and MBB-1A microscopes is the position of the light beam collimating lens:
- in the Lomo MBB-1A microscope this lens is normally located below the Abbe condenser
- in the Lomo MIN-8 microscope this lens is located in the base, in the light path directly behind the field diaphragm

Here I present and offer the complete mechanism for mounting and moving this lens:
- lens in housing
- rod on which the lens is mounted
- holder allowing movement of the lens
- mounting screws

This lens is used to shape the light beam so that the specimen is evenly illuminated at low magnifications.

Description of this part for the microscope.

On the condenser, the model name is written in Cyrillic and looks similar to ON-14.

The Lomo OI-14 condenser has a removable (unscrewable) top lens:
- A1.4 with high aperture, for use with objectives with high numerical aperture (which corresponds to high magnifications, it can be assumed above 40x)
- A0.3 with low aperture, for use with low magnification objectives

Although it is possible to work with low magnification objectives (e.g. 5x or 10x) using a condenser with the A1.4 lens installed - the image is too "sharp" and contrasty. In this case, replacing the lens with A0.3 allows obtaining a pastel, soft and visually pleasant image.

Since the Lomo OI-14 condenser has been produced since the 1960s, over the years this additional lens has very often been lost and most condensers available on the secondary market have only one - most often A1.4.

The Lomo OI-14 condenser has a mounting diameter of 37 mm, but since it is very popular among microscope users, an extension ring is often used, allowing it to be mounted in microscopes with a 39.5 mm condenser holder. This condenser fits microscopes from various manufacturers: Lomo, PZO, Zeiss, Carl Zeiss Jena, Meopta, IOR, Olympus, ROW, Nikon, Leitz Wetzlar and many others.

Description of this part for the microscope.

as a filter holder.

Mechanically, this lens in its housing is located in the microscope base, underneath the condenser. It is screwed into the base (the housing is threaded), while the light source (halogen or LED) is located directly below this collector.

The N-117M / DN-117M microscope is a fairly good laboratory microscope manufactured at the Chinese NYO factory and sold worldwide under various names. These microscopes are known and sold, among others, as:
- Delta Optical Genetic Pro (mainly in Poland)
- AmScope B340 / T340 (mainly in the USA and the rest of the world through Amazon)
- Labtron LEM-C10 / C11 / C12 (mainly in the UK)
- Sigeta MB-207 (mainly in Ukraine)
- Boeco Germany BM-117 (mainly in Germany)
- BestScope BS-2020 (mainly in the USA, shipped worldwide)
- Brunel N117M (mainly in the UK)
- Apex N-117M (mainly in the UK)
- Surgifield SM-DN-117M (mainly in Nigeria and West Africa)
- Eurotech DN-117M (mainly in Peru)
- Biocare DN-117M (mainly in Peru)
- Viresa N-117M (mainly in Mexico)
- Eurolab DN-117M
- Nexcope N-117M
- Novel N-117M

This is certainly not a complete list – many sellers give the microscopes they sell their own names (just like Delta Optical in Poland). The best way to check whether this microscope part fits your microscope is to compare the appearance of your microscope with the microscope from which this microscope part was removed (https://www.microscopeparts.eu/microscope/optical-n-117m-388).

The N-117M model has a binocular or trinocular head, while the DN-117M model has a built-in digital USB camera (hence the “D” at the beginning of the name, for “Digital”). However, the microscope body is identical – regardless of whether a halogen bulb or LED is used for illumination. Therefore, this collector lens is also the same in all these models.

This microscope part performs several functions:
- it collimates the light beam
- the built-in frosted glass diffuser provides uniform illumination, preventing discoloration in the area of the filament
- it also serves as the holder for round filters

The last photos in the gallery show the entire N-117M type microscope, with an arrow indicating which microscope part is being described and where it is located. This helps prevent any confusion when identifying the microscope part.

Description of this part for the microscope.

Mechanically, it is located inside the microscope head mounting bracket and is screwed into the objective nosepiece from above, so it also serves as the mounting for the objective nosepiece.

The N-117M / DN-117M microscope is a fairly good laboratory microscope manufactured at the Chinese NYO factory and sold worldwide under various names. These microscopes are known and sold, among others, as:
- Delta Optical Genetic Pro (mainly in Poland)
- AmScope B340 / T340 (mainly in the USA and the rest of the world through Amazon)
- Labtron LEM-C10 / C11 / C12 (mainly in the UK)
- Sigeta MB-207 (mainly in Ukraine)
- Boeco Germany BM-117 (mainly in Germany)
- BestScope BS-2020 (mainly in the USA, shipped worldwide)
- Brunel N117M (mainly in the UK)
- Apex N-117M (mainly in the UK)
- Surgifield SM-DN-117M (mainly in Nigeria and West Africa)
- Eurotech DN-117M (mainly in Peru)
- Biocare DN-117M (mainly in Peru)
- Viresa N-117M (mainly in Mexico)
- Eurolab DN-117M
- Nexcope N-117M
- Novel N-117M

This is certainly not a complete list – many sellers give the microscopes they sell their own names (just like Delta Optical in Poland). The best way to check whether this microscope part fits your microscope is to compare the appearance of your microscope with the microscope from which this microscope part was removed (https://www.microscopeparts.eu/microscope/optical-n-117m-388).

The N-117M model has a binocular or trinocular head, while the DN-117M model has a built-in digital USB camera (hence the “D” at the beginning of the name, for “Digital”) – but the stand is shared by both models, so this Telan lens fits both models.

Microscopes based on the N-117M model have an objective nosepiece tilted inward, and in my opinion this is why a Telan lens is required even though this is a microscope using optics corrected for a 160 mm tube length.

Other names are sometimes used for the Telan lens installed in the microscope, for example:
- nosepiece lens
- intermediate lens
- tube lens (although this is an incorrect term, because a really “Tube lens” has a different function)

The last photo in the gallery shows the stand of an N-117M type microscope, with an arrow indicating which microscope part is being described and where it is located. This helps prevent any confusion when identifying the microscope part.