# Part name:
Olympus BH-2 microscope eyepiece tube with diopter adjustment ring for BH2-TR30 trinocular and BH2-BI30 binocular head

# Original page URL:
https://www.microscopeparts.eu/part/olympus-bh-2-microscope-eyepiece-tube-with-diopter-adjustment-ring-for-bh2-tr30-trinocular-and-bh2-bi30-99904

# Part manufacturer:
Olympus

# Full manufacturer name:
Olympus Corporation Tokyo Japan

# Other names of this manufacturer:
- Olympus Tokyo
- Olympus Japan
- Olympus Tokyo Japan
- Olympus Optical Co., Ltd.
- Olympus Corporation.
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:
Service and spare parts

# Description and specifications:
Eyepiece tube with a 23.2 mm seat diameter and a diopter adjustment ring, for the heads used on Olympus BH-2 / IMT-2 microscopes

This is a tube with a diopter adjustment ring fitted, which lets you correct the refractive error of one eye and focus the image properly. It is mounted on the left side of the microscope head, and without certain DIY modifications it cannot be moved to the right side.

This particular tube was removed from an Olympus BH2-BI30 binocular head, but it should also fit, among others, the following microscope heads with tubes for eyepieces of 23.2 mm diameter:
- Olympus BH2-BI30
- Olympus BH2-TR30
- Olympus BH2-TBI
- Olympus BH2-TTR
- Olympus BH2-TET

Before you decide to use it to repair a head other than the one it was removed from, I recommend checking it first with specialists on forums or groups devoted to Olympus microscopes.

This tube with diopter adjustment is not a spare part for the microscope itself. It is a repair part for an Olympus microscope head - and that head can sit on various microscopes, even on instruments from manufacturers other than Olympus. The most important microscopes this head is most often used with are listed in the "compatibility" section, but this is by no means a complete list.

The irreplaceable Carl Hunsinger has written an excellent service manual for the BH2-BI30 microscope head (https://www.alanwood.net/downloads/olympus-bh2-bi30-binocular-head-repair.pdf) and for the BH2-TR30 (https://www.alanwood.net/downloads/olympus-bh2-tr30-trinocular-head-repair-manual.pdf).

Here are the microscope models in which the heads this tube fits are most often used:
- Olympus BH-2 BHS
- Olympus BH-2 BHT
- Olympus BH-2 BHTU
- Olympus IMT-2

A note on the eyepiece tube diameter: the mounting diameter for the eyepieces is 23.2 mm, but some sources state 23 mm or 23.5 mm - that is a rounded measurement, and it is still one and the same tube.

# Examples of use
- very often this tube is dented and an eyepiece cannot be inserted
- very often the diopter adjustment ring becomes damaged and does not function
- if you need a tube with precise worm adjustment for your own DIY purposes

# Removed from microscope:
Olympus BH-2

# Also compatible with the following microscopes:
- Olympus BH-2
- Olympus BH-2 BHS
- Olympus BH-2 BHTU
- Olympus IMT-2

# Names, descriptions, terms, and search contexts under which this part is searched.
- Olympus BH-2 microscope repair parts
- Olympus BH2-BI30 Okularstutzen mit Dioptrienring
- Dioptrienring am Olympus BH-2 Binokularkopf dreht durch
- Okularstutzen Olympus BH2-TR30 Trinokularkopf verbogen
- Olympus BH2-TBI TTR TET Okularstutzen 23.2mm
- Olympus BHS BHT BHTU IMT-2 Okulartubus tauschen
- Olympus BH-2 Kopf zerlegen und reinigen
- Olympus BH-2 Mikroskop restaurieren Okularstutzen
- Olympus BH-2 eyepiece tube with diopter ring replacement
- diopter ring stuck Olympus BH2-BI30 binocular head
- Olympus BH2-BI30 eyepiece tube damaged
- left eyepiece tube 23.2mm Olympus BH2-TR30 trinocular head
- Olympus BH-2 head DIY diopter adjustment both tubes
- tubus okularowy 23.2mm z regulacją dioptrii Olympus BH2-BI30
- okulárový tubus 23.2mm s dioptrickou korekcí Olympus BH2-BI30
- tubo portaocular 23.2mm con ajuste de dioptrias Olympus BH2-BI30
- repuesto cabezal binocular Olympus BH-2 / IMT-2
- tubo portaoculare 23.2mm con regolazione diottrica Olympus BH2-BI30
- ricambio testata binoculare Olympus BH-2 / IMT-2
- Olympus buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99904.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99904.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99904-olympus-bh-2-microscope-eyepiece-tube-with-diopter-adjustment-ring-for-bh2-tr30-trinocular-and-bh2-bi30
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99904.media.md
- Representative photo: https://www.microscopeparts.eu/photo/olympus-bh-2-microscope-eyepiece-tube-with-diopter-adjustment-ring-for-bh2-tr30-trinocular-and-bh2-bi30-99904-2
- Representative video: https://www.microscopeparts.eu/play/99904-1
- Other parts from category Service and spare parts: https://www.microscopeparts.eu/service-and-spare-parts
- More Service and spare parts removed from microscope Olympus BH-2: https://www.microscopeparts.eu/service-and-spare-parts/from/olympus/bh-2
- More Service and spare parts compatible with microscope Olympus BH-2: https://www.microscopeparts.eu/service-and-spare-parts/for/olympus/bh-2
- More Service and spare parts removed from microscopes Olympus: https://www.microscopeparts.eu/service-and-spare-parts/from/olympus
- More Service and spare parts compatible with microscopes Olympus: https://www.microscopeparts.eu/service-and-spare-parts/for/olympus

# 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: 2026-10-18