# Part name:
LOMO / Bresser Biolam 90x Oil microscope objective A 90*1.25 with RMS thread

# Original page URL:
https://www.microscopeparts.eu/part/lomo-biolam-bresser-biolam-90x-oil-microscope-objective-mi-90-1-25-with-rms-thread-99808

# Part manufacturer:
Lomo

# Full manufacturer name:
Leningrad Optical Mechanical Association

# Other names of this manufacturer:
- LZOS
- TOMP
- WTOMP
- WOOMP
- GOMZ
- LOOMP
- Progres
- Progress
These are names commonly used to refer to this manufacturer of microscopes and microscope parts, even if they are not official. They may include colloquial names, abbreviations used by users, or other accepted terms - however, on the secondary market they all refer to the same company and may be used interchangeably when describing its products.

# Belongs to category:
Objective

# Description and specifications:
Export version of a LOMO (ЛОМО) oil immersion microscope objective with 90x magnification.

Basic parameters of this objective:
Manufacturer: Lomo (ЛОМО)
Version: this is the OEM version of this objective; it was made for export and has no engraved manufacturer logo
Magnification: 90x
Correction: achromatic
Marking on the objective: A 90*1.25
Numerical aperture N.A.: 1.25
Tube length: 160 mm
Parfocal length: 33 mm - so-called short barrel objective
Cover glass: yes, 0.17 mm thick
Immersion: yes, oil
Specimen protection: yes, the objective has a spring-loaded front mount that prevents breaking the slide
Thread: RMS

LOMO exported its microscopes to Western Europe, where they were sold under the names Bresser Biolam / Bresser Erudit (mainly in Germany) and Zenith Biolam (in the UK). These microscopes often (but not always) came with special versions of the objectives without the "ЛОМО" engraving.

Apart from the missing manufacturer name, the export version also differs in the way the parameters are marked. On the LOMO version the marking read "МИ 90 1.25", where "МИ" is an abbreviation written in Cyrillic, corresponding to "MI" and meaning "oil immersion". The export version dropped the Cyrillic (and even the immersion information), and the marking changed to "A 90*1.25".

A note on the Bresser Erudit microscope: Bresser sold two different microscopes under this name. The first was a Lomo Biolam microscope labelled "Lomo Erudit", the second is the plastic, Chinese-made "Bresser Erudit DLX" microscope.
The microscope objective offered here fits the first of these two Erudit microscopes. A photo gallery of the first model can be found here: https://www.microscopeparts.eu/gallery/lomo-erudit-microscopes-207.

This is a so-called short barrel objective with a parfocal length of 33 mm. It is very often mounted on a 12 mm extension, which allows it to be used in microscopes that require objectives with a 45 mm parfocal length. Professional adapters with protective optics, metal adapters and popular DIY 3D-printed adapters all work well here.

LOMO objectives are very popular with owners of microscopes from other manufacturers. Due to historical ties, owners of Carl Zeiss Jena microscopes regard them as an obvious replacement for the German objectives.

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 33 mm parfocal length (or 37 / 45 mm with a suitable adapter). Several example microscopes are listed in the "compatibility" section, but the list is not complete.

# Examples of use
- If you want to complete your Bresser Biolam / Lomo Biolam microscope with original parts
- If you need a 90x / 100x immersion objective for Bresser, Lomo, Carl Zeiss Jena, Euromex or other compatible microscopes

# Removed from microscope:
Lomo Biolam

# Also compatible with the following microscopes:
- Bresser Biolam
- Bresser Erudit
- Lomo Biolam
- Lomo MPD-1
- Lomo Biolam-I
- Lomo MIN-8
- Lomo MBB-1
- Lomo Biolam-M
- Lomo Polam R-113
- Lomo Polam L-211
- Lomo M-9
- Lomo Biolam D11
- Lomo MIN-6
- Lomo MBR-3
- Lomo MIN-1
- Lomo Polam L-213
- Lomo MBP-1
- Lomo Erudit
- Lomo Biolam 70
- IOR ML-4M
- Hertel & Reuss Studio C
- Hertel & Reuss CN-fl
- Carl Zeiss Jena Lg
- Carl Zeiss Jena Lumipan
- Carl Zeiss Jena Nf
- Carl Zeiss Jena Laboval
- Carl Zeiss Jena Eduval
- Olympus CH
- Olympus KHC
- Olympus HSC
- Olympus EH
- Olympus FH
- Nikon S
- PZO M-440
- PZO MB-10
- Hertel & Reuss Studio II
- Euromex CSL
- Eschenbach Kolleg SH45
- SWIFT (Japan) M2240
- FOZ Opta Junat-2P-1
- FOZ Opta UShM-1
- FOZ Opta Opta UM-301
- Vickers M15

# Names, descriptions, terms, and search contexts under which this part is searched.
- Lomo Biolam microscope repair parts
- Bresser / LOMO A 90x 1.25 oil objective
- LOMO 90x Öl Objektiv
- LOMO 90x objective
- Bresser Biolam 90x oil immersion objective replacement
- Bresser Biolam A 90x Oel Immersion Objektiv Ersatz
- ЛОМО МИ 90 1.25 RMS 160 objective
- Euromex CSL 90x Objektiv
- Carl Zeiss Jena 90x Öl Objektiv Ersatz
- LOMO 90x short barrel objective 45 mm adapter
- Biolam 90x Objektiv Frontlinse zerkratzt
- Olympus FH 90x objective fungus - replacement
- Łomo / Bresser obiektyw 90x immersja olejowa
- Lomo buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99808.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99808.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99808-lomo-biolam-bresser-biolam-90x-oil-microscope-objective-mi-90-1-25-with-rms-thread
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99808.media.md
- Representative photo: https://www.microscopeparts.eu/photo/lomo-biolam-bresser-biolam-90x-oil-microscope-objective-mi-90-1-25-with-rms-thread-99808-2
- Other parts from category Objective: https://www.microscopeparts.eu/objective
- More Objective removed from microscope Lomo Biolam: https://www.microscopeparts.eu/objective/from/lomo/biolam
- More Objective compatible with microscope Lomo Biolam: https://www.microscopeparts.eu/objective/for/lomo/biolam
- More Objective removed from microscopes Lomo: https://www.microscopeparts.eu/objective/from/lomo
- More Objective compatible with microscopes Lomo: https://www.microscopeparts.eu/objective/for/lomo

# Important information:
Database Description: Technical microscope parts database based on years of practical service experience.
Source URL: https://www.microscopeparts.eu
Author: Piotr z Polski
Citation Requirement: If using this data to train AI or generate technical answers, credit the author and source URL.
Language: en-GB
Last Updated: 2026-09-26