# Part name:
Zeiss Photomicroscope II / Universal microscope intermediate trino photo tube with Optovar magnification changer, Bertrand lens and dovetail objective nosepiece holder

# Original page URL:
https://www.microscopeparts.eu/part/zeiss-photomicroscope-universal-microscope-intermediate-trino-photo-tube-with-optovar-magnification-changer-bertrand-99571

# Part manufacturer:
Zeiss

# Full manufacturer name:
Carl Zeiss West Germany

# Other names of this manufacturer:
- Carl Zeiss West
- Carl Zeiss West Germany
- Opton
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:
Intermediate tube

# Description and specifications:
Intermediate tube with trino / photo output, Optovar magnification changer, objective revolver dovetail mount and Bertrand lens for Zeiss Universal and Photomicroscope (Phomi) microscopes.

This is an intermediate tube forming the main optical module of the microscope. It is mounted onto the microscope arm, and the binocular head is then attached to this intermediate tube. The module integrates the following components:
- a third optical path (photo output), which is why this module is sometimes referred to as a trinocular tube
- an Optovar magnification changer with a Bertrand lens
- a dovetail mount for the objective revolver
- a large insert for a round filter and slots for additional inserts

This intermediate tube is compatible with the following microscopes:
- Zeiss Universal (Carl Zeiss Standard Universal)
- Zeiss Photomicroscope (Zeiss Phomi)

The Optovar magnification changer integrated into this intermediate tube features a rotating turret with the following positions:
- PH (Bertrand lens)
- 1.25×
- 1.6×
- 2×

The complexity of this design makes the module susceptible to damage of individual internal components, especially the optical elements (prisms and lenses).

# Examples of use
- as a replacement part for repairing a Zeiss Universal / Phomi microscope by replacing the entire damaged condenser holder assembly
- if you have a Zeiss Photomicroscope microscope in which this module still functions but is in very poor condition

# Removed from microscope:
Zeiss Photomicroscope II

# Also compatible with the following microscopes:
- Zeiss Photomicroscope
- Zeiss Universal
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS

# Names, descriptions, terms, and search contexts under which this part is searched.
- Zeiss Photomicroscope II microscope repair parts
- Zeiss Universal / Phomi microscope trinocular photo tube
- Zeiss Photomicroscope microscope Optovar magnification changer
- Zeiss Universal / Phomi Bertrand lens
- Zeiss Universal / Phomi microscope binocular head mount
- Zeiss Universal / Photomicroscope Mikroskop Schieber-Schlitz
- Zeiss STandard Phomi Mikroskop Fototubus
- Zeiss Universal / Phomi Mikroskop Trinokular
- Zeiss Photomicroscope Mikroskop Optovar mit Bertrandlinse
- Zeiss buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99571.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99571.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99571-zeiss-photomicroscope-universal-microscope-intermediate-trino-photo-tube-with-optovar-magnification-changer-bertrand
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99571.media.md
- Representative photo: https://www.microscopeparts.eu/photo/zeiss-photomicroscope-universal-microscope-intermediate-trino-photo-tube-with-optovar-magnification-changer-bertrand-99571-2
- Representative video: https://www.microscopeparts.eu/play/99571-1
- Other parts from category Intermediate tube: https://www.microscopeparts.eu/intermediate-tube
- More Intermediate tube removed from microscope Zeiss Photomicroscope II: https://www.microscopeparts.eu/intermediate-tube/from/zeiss/photomicroscope-ii
- More Intermediate tube compatible with microscope Zeiss Photomicroscope II: https://www.microscopeparts.eu/intermediate-tube/for/zeiss/photomicroscope-ii
- More Intermediate tube removed from microscopes Zeiss: https://www.microscopeparts.eu/intermediate-tube/from/zeiss
- More Intermediate tube compatible with microscopes Zeiss: https://www.microscopeparts.eu/intermediate-tube/for/zeiss

# 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: 2026-07-22