# Part name:
Zeiss (West Germany) microscope Ph2 phase annulus insert | phase condenser PH-diaphragm ring

# Original page URL:
https://www.microscopeparts.eu/part/zeiss-photomicroscope-iii-rs-west-germany-microscope-ph2-phase-annulus-insert-phase-condenser-ph-diaphragm-ring-99640

# 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:
Service and spare parts

# Description and specifications:
Interchangeable Ph2 phase annulus (diaphragm ring) with retaining ring for Zeiss West Germany phase contrast condensers.

Interchangeable diaphragm rings (both for phase contrast and darkfield) allow a phase contrast condenser to be configured individually. This makes it possible to use exactly the observation techniques and exactly the microscope objectives required.

Basic parameters of this phase annulus:
Manufacturer: Carl Zeiss (Oberkochen, West Germany)
Condenser marking: "2"
For objectives: marked "Ph2", i.e. magnifications from 16x to 40x
Material: glass mounted in a metal retaining ring with flange
Outside diameter of the retaining ring: 22 mm
Phase annulus glass diameter: 16 mm
Height of the retaining ring: 3.5 mm

Important: this microscope component (phase annulus / phase diaphragm) is not intended for any specific microscope model. It is a component used to upgrade or repair a microscope phase contrast condenser. It is not intended for upgrading or repairing one specific condenser model. Many Carl Zeiss condenser models have a suitable opening into which this phase annulus can be inserted.

This particular phase annulus was removed from a fluorescence phase contrast condenser — an older version of the Zeiss condenser P/N 46 52 78. Before installing it in your condenser, carefully compare the shape of its housing and the dimensions of the retaining ring.

The last photograph in the gallery shows the turret disc of a Zeiss phase contrast condenser. An arrow indicates this very phase annulus — the one offered here — already installed.

# Examples of use
- if the Ph2 phase diaphragm in your Zeiss phase contrast condenser has been damaged
- if you have a Zeiss phase contrast condenser equipped with a set of diaphragm rings (phase annuli) that does not include the Ph2 phase annulus
- if you would like to use this Ph2 phase diaphragm for your own DIY project, for example to use a Zeiss Ph2 microscope objective on another microscope

# Removed from microscope:
Zeiss Photomicroscope III RS

# Also compatible with the following microscopes:
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS
- Zeiss Standard 14
- Zeiss Standard GFL
- Zeiss Standard WL
- Zeiss Standard 16
- Zeiss Universal
- Zeiss Photomicroscope
- Zeiss Ultraphot
- Zeiss Standard 20
- Zeiss Standard 25

# Names, descriptions, terms, and search contexts under which this part is searched.
- Zeiss Photomicroscope III RS microscope repair parts
- Carl Zeiss Mikroskop Phasenkontrast Kondensor PH2 Ring-Blende
- Carl Zeiss microscope PH2 phase contrast condenser diaphragm ring
- Zeiss (West Germany) Mikroskop Ph2 Phasenring
- Carl Zeiss Phasenkontrast-Kondensor Ringblende
- Zeiss (West Germany) microscope Ph2 phase annulus insert
- Zeiss buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99640.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99640.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99640-zeiss-photomicroscope-iii-rs-west-germany-microscope-ph2-phase-annulus-insert-phase-condenser-ph-diaphragm-ring
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99640.media.md
- Representative photo: https://www.microscopeparts.eu/photo/zeiss-photomicroscope-iii-rs-west-germany-microscope-ph2-phase-annulus-insert-phase-condenser-ph-diaphragm-ring-99640-2
- Other parts from category Service and spare parts: https://www.microscopeparts.eu/service-and-spare-parts
- More Service and spare parts removed from microscope Zeiss Photomicroscope III RS: https://www.microscopeparts.eu/service-and-spare-parts/from/zeiss/photomicroscope-iii-rs
- More Service and spare parts compatible with microscope Zeiss Photomicroscope III RS: https://www.microscopeparts.eu/service-and-spare-parts/for/zeiss/photomicroscope-iii-rs
- More Service and spare parts removed from microscopes Zeiss: https://www.microscopeparts.eu/service-and-spare-parts/from/zeiss
- More Service and spare parts compatible with microscopes Zeiss: https://www.microscopeparts.eu/service-and-spare-parts/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: 2026-07-25