# Part name:
Zeiss Photomicroscope / Universal microscope heat absorbing filter and second collector lens from microscope base

# Original page URL:
https://www.microscopeparts.eu/part/zeiss-photomicroscope-universal-microscope-heat-absorbing-filter-and-second-collector-lens-from-microscope-base-99636

# 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:
Filters

# Description and specifications:
Module of the heat absorbing filter (the so-called KG filter) and the second collector lens of the Köhler illumination for the base of Carl Zeiss Universal and Photomicroscope microscopes.

In the base of Zeiss Universal / Zeiss Photomicroscope class microscopes there is a set of lenses that collimate the light beam. Together they form the collector of the Köhler illumination, even though they are not mechanically connected to each other.

Here I present a module consisting of:
- the second collector lens in the light path
- the heat filter (heat absorbing KG filter)
- the metal mount holding these two glass elements
- the screws used to fasten this mount with the lens and filter to the microscope base

The last photos in the gallery show the complete base of a Zeiss Photomicroscope III microscope, with an arrow indicating which element this is and exactly where it is located, which allows unambiguous identification of this part.

This lens-filter assembly fits the bases of the following microscope models:
- Zeiss Universal
- Zeiss Photomicroscope I
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III / III RS

This is a service part for those who need to replace this component in their microscope. It is not a complete illumination collector.

Replacing this part can remedy, among others, the following problems:
- the KG filter is cracked or chipped, which often happens due to overheating or a shock during transport
- the collimator lens (i.e. the second lens in the Köhler system) is cracked, chipped or damaged by fungus
- one of the metal parts is bent or broken: the filter mount, the lens mount or the mount to the microscope base

Over the years, Carl Zeiss microscopes of the Photomicroscope series have acquired various names that users commonly call them by. These include, among others:
- Zeiss Photomikroskop
- PM, e.g. Zeiss PM II or Zeiss PM III
- Zeiss Phomi, e.g. Zeiss Phomi II
It should also be mentioned that Zeiss Photomicroscope microscopes were also sold under the Opton brand.

# Examples of use
- as a service part if you have a microscope in which this element is damaged, incomplete or perhaps even missing
- if you need a KG heat filter for another microscope or for another module in the same microscope
- if you need a collimator lens for your own DIY project
- some examples of when this element is needed are listed in the description

# Removed from microscope:
Zeiss Photomicroscope

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

# Names, descriptions, terms, and search contexts under which this part is searched.
- Zeiss Photomicroscope microscope repair parts
- Zeiss Photomicroscope KG heat filter cracked replacement
- Zeiss Phomi Wärmeschutzfilter gesprungen ersetzen
- Zeiss Universal Mikroskop Kollektorlinse im Stativfuß
- Zeiss PM III collector lens fungus in microscope base
- Zeiss PM II KG-Filter angeschlagen - Beleuchtung im Fuß
- Zeiss Photomicroscope III RS heat absorbing filter with collector lens mount
- Opton Photomikroskop Wärmeschutzfilter mit Kollektorlinse
- Zeiss KG heat filter for DIY microscope illuminator
- Zeiss Universal Köhler illumination second collector lens
- pęknięty filtr cieplny KG z podstawy mikroskopu Zeiss Photomicroscope
- Zeiss buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99636.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99636.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99636-zeiss-photomicroscope-universal-microscope-heat-absorbing-filter-and-second-collector-lens-from-microscope-base
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99636.media.md
- Representative photo: https://www.microscopeparts.eu/photo/zeiss-photomicroscope-universal-microscope-heat-absorbing-filter-and-second-collector-lens-from-microscope-base-99636-2
- Representative video: https://www.microscopeparts.eu/play/99636-1
- Other parts from category Filters: https://www.microscopeparts.eu/filters
- More Filters removed from microscope Zeiss Photomicroscope: https://www.microscopeparts.eu/filters/from/zeiss/photomicroscope
- More Filters compatible with microscope Zeiss Photomicroscope: https://www.microscopeparts.eu/filters/for/zeiss/photomicroscope
- More Filters removed from microscopes Zeiss: https://www.microscopeparts.eu/filters/from/zeiss
- More Filters compatible with microscopes Zeiss: https://www.microscopeparts.eu/filters/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: 2026-09-21