# Part name:
Lomo Biolam / MBB-1A KOH-3 microscope condenser | Abbe KON-3 N.A. 1,2 with iris diaphragm

# Original page URL:
https://www.microscopeparts.eu/part/lomo-biolam-mbb-1a-koh-3-microscope-condenser-abbe-kon-3-n-a-1-2-with-iris-diaphragm-99053

# 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:
Condensers

# Description and specifications:
Lomo microscope condenser with a numerical aperture of 1.2.

In the manufacturer's catalog this condenser is designated as KOH-3. This is a Cyrillic notation, where the letter "H" corresponds to the Latin "N". This means that the model name written in the Latin alphabet is KON-3, where "KON" is simply an abbreviation of the word condenser.

Basic data:
- Element: Abbe microscope condenser
- Manufacturer: Lomo
- Manufacturer designation: KOH-3
- Numerical aperture: 1.2
- Numerical aperture with top lens removed: 0.3
- Mounting diameter: 37 mm
- Iris diaphragm: YES
- Wide-field lens: YES, with the possibility of moving it into / out of the light path
- filter holder: YES

This condenser also fits microscopes from other manufacturers (e.g. Meopta, Olympus, Carl Zeiss Jena and many others) with a 37 mm condenser mount.

Important: Although the mounting diameter of the KOH-3 condenser is 37 mm, the top lens slightly protrudes beyond the condenser body. For this reason, in some cases installation requires the following steps:
- unscrew the top lens
- install the condenser in the holder
- screw the top lens back in

Note: If you use this condenser with a microscope from a manufacturer other than Lomo, please note that:
- the filter holder is designed for filters with a diameter of 33 mm
- while most manufacturers use the 32 mm standard diameter
As a result, 32 mm filters cannot be used in the KOH-3 condenser without modification - they simply fall out because the holder diameter is too large.

# Examples of use
- if you have a Lomo microscope and want to use this condenser
- if you want to use this element in a microscope from another manufacturer with 74 mm mount diameter
- if you want to assemble a fully equipped microscope with as many accessories as possible and this condenser is missing from your set

# Removed from microscope:
Lomo Biolam

# Also compatible with the following microscopes:
- Lomo Biolam
- Lomo MBB-1
- Lomo Biolam-M
- Lomo M-9
- Lomo Biolam D11
- Lomo MBI-1
- Lomo MBR-3
- Lomo MBP-1
- Lomo Biolam 70
- Olympus CH-2 CHT
- Meopta DD 37 BN

# Names, descriptions, terms, and search contexts under which this part is searched.
- Lomo Biolam microscope repair parts
- Lomo Biolam microscope condenser
- kondensor mikroskopowy Lomo
- Lomo MBB-1A Mikroskopkondensor
- Lomo Biolam Mikroskop Kondensor
- Kondensor für Bresser Biolam Mikroskop
- Mikroskop Kondensor mit 37 mm Durchmesser
- Irisblende bei Mikroskop Kondensor funktioniert nicht
- Lomo buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99053.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99053.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99053-lomo-biolam-mbb-1a-koh-3-microscope-condenser-abbe-kon-3-n-a-1-2-with-iris-diaphragm
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99053.media.md
- Representative photo: https://www.microscopeparts.eu/photo/lomo-biolam-mbb-1a-koh-3-microscope-condenser-abbe-kon-3-n-a-1-2-with-iris-diaphragm-99053-2
- Representative video: https://www.microscopeparts.eu/play/99053-1
- Other parts from category Condensers: https://www.microscopeparts.eu/condensers
- More Condensers removed from microscope Lomo Biolam: https://www.microscopeparts.eu/condensers/from/lomo/biolam
- More Condensers compatible with microscope Lomo Biolam: https://www.microscopeparts.eu/condensers/for/lomo/biolam
- More Condensers removed from microscopes Lomo: https://www.microscopeparts.eu/condensers/from/lomo
- More Condensers compatible with microscopes Lomo: https://www.microscopeparts.eu/condensers/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: 2026-07-31