# Part name:
Zeiss Axio Imager 2 / Axioscope 5 microscope PN 425503-9901 trinocular phototube 0:100 / 100:0 w. 425308 infinity tube lens

# Original page URL:
https://www.microscopeparts.eu/part/zeiss-axio-imager-2-axioscope-5-microscope-pn-425503-9901-trinocular-phototube-0-100-100-0-w-425308-infinity-tube-99382

# 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:
First, the most important thing - carefully look at the photos. Note that this trinocular (photo tube) does not include a binocular eyepiece head.

Zeiss photo tube.
Application: Zeiss Axio microscopes, second series
Manufacturer number: 425503-9901-000
Light split: 0/100 and 100/0

This trinocular photo tube contains a Zeiss infinity correction tube lens 425308-0000-000.

Parameters of the Zeiss 425308 lens:
Lens type: correction lens (en: infinity corrected tube lens)
Magnification: none (i.e. 1x)
Wavelength range: 380 - 700 nm
Diameter: 40 mm
Length: 12.8 mm
Thread: M36 x 0.75

The Zeiss tube lens 425308-0000-000 is required to use infinity-corrected Zeiss microscope objectives on microscopes from other manufacturers - including those designed for 160 mm tube length. It is also very often used in super macro photography to connect infinity-corrected objectives to a camera.

This element can be a solution to the following issues:
- How to repair or replace the prism in the Zeiss 425503 photo tube?
- What to do in case of prism delamination in the Zeiss 425503 head?
- Repair of a mechanically damaged Zeiss 425503 trinocular tube
- What to do if the Zeiss "tube lens" 425308 is damaged, scratched, or of poor quality?
- Can Zeiss objectives be used on microscopes from other manufacturers?
- Can infinity-corrected objectives be used on a 160 mm microscope?
- How to take super macro photos using infinity-corrected microscope objectives?

And once again at the end: carefully look at the photos. Note that this trinocular (photo tube) does not include a binocular eyepiece head.

# Examples of use
- the description contains a list of potential applications
- allows converting a microscope with a binocular head into a trinocular photo system

# Removed from microscope:
Zeiss Axio Imager 2

# Also compatible with the following microscopes:
- Zeiss Axio Imager 2
- Zeiss Axioscope 5
- Zeiss Axioskop 2
- Zeiss Axio Imager M1

# Names, descriptions, terms, and search contexts under which this part is searched.
- Zeiss Axio Imager 2 microscope repair parts
- Carl Zeiss Axioskop Mikroskop Fototubus
- Zeiss Axio Imager Mikroskop Trinokular
- Zeiss Axioscope Mikroskop Fototubus Trinocular
- Zeiss Axio microscope trinocular
- Zeiss Axio Imager phototube
- Zeiss 425503 phototube
- Zeiss 425503-9901 Fototubus
- Zeiss buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99382.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99382.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99382-zeiss-axio-imager-2-axioscope-5-microscope-pn-425503-9901-trinocular-phototube-0-100-100-0-w-425308-infinity-tube
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99382.media.md
- Representative photo: https://www.microscopeparts.eu/photo/zeiss-axio-imager-2-axioscope-5-microscope-pn-425503-9901-trinocular-phototube-0-100-100-0-w-425308-infinity-tube-99382-2
- Representative video: https://www.microscopeparts.eu/play/99382-1
- Other parts from category Intermediate tube: https://www.microscopeparts.eu/intermediate-tube
- More Intermediate tube removed from microscope Zeiss Axio Imager 2: https://www.microscopeparts.eu/intermediate-tube/from/zeiss/axio-imager-2
- More Intermediate tube compatible with microscope Zeiss Axio Imager 2: https://www.microscopeparts.eu/intermediate-tube/for/zeiss/axio-imager-2
- 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: 2026-06-30