# Part name: Zeiss Photomicroscope / Universal microscope Bertrand lens for DIC and phase contrast alignment | spare part for photo intermediate tube # Original page URL: https://www.microscopeparts.eu/part/zeiss-photomicroscope-universal-microscope-bertrand-lens-for-dic-and-phase-contrast-alignment-spare-part-for-photo-91045 # 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: Lenses # Description and specifications: Amici-Bertrand lens for the photo intermediate tube of Carl Zeiss Universal / Photomicroscope class microscopes. In Zeiss Universal / Zeiss Photomicroscope class microscopes, the intermediate tube (https://www.microscopeparts.eu/part/99571) contains a horizontally mounted barrel with a prism that splits the light towards the trinocular/photo port. The individual positions are switched by pulling and pushing the control knob (https://www.microscopeparts.eu/part/91040). The Amici-Bertrand lens, used for aligning DIC and the phase contrast rings, is mounted in the same place - and that is the lens presented here. Why is this lens located in the light-splitting module, even though the PH marking is on the turret of the Optovar magnification changer? The reason is simple: the first Zeiss Universal models had no magnification changer, so the Amici-Bertrand lens was mounted next to the beam splitting prism and is swung in with the same knob that switches the photo mode. When the magnification changer (with the 1.25x / 1.6x and 2x positions) was added to the newer models, a PH position was provided on the changer as well, containing no lens at all (an empty slot) - because the Bertrand lens for phase contrast stayed where it had always been. You can see the construction of the magnification changer and this empty slot here: https://www.microscopeparts.eu/part/91043. This lens fits the intermediate tubes used in the following microscopes: - Zeiss Universal - Zeiss Photomicroscope I - Zeiss Photomicroscope II - Zeiss Photomicroscope III / III RS - Zeiss Ultraphot This is a service part for those who need to replace this element in their microscope, or who want to use the Amici-Bertrand lens for their own DIY projects. Over the years, Carl Zeiss Photomicroscope series microscopes have acquired various names commonly used by their owners. 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 sold under the Opton brand as well. # Examples of use - if you have a microscope in which this element is missing (e.g. somebody unscrewed the lens for cleaning and never put it back) - if you have a microscope in which this lens does work, but is in very poor condition, e.g. fungus damaged or scratched - if you want to use this Amici-Bertrand lens for your own DIY project or another microscope # Removed from microscope: Zeiss Photomicroscope # Also compatible with the following microscopes: - Zeiss Universal - Zeiss Photomicroscope - Zeiss Ultraphot - 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 intermediate tube service and repair - Zeiss Phomi Foto-Zwischentubus reparieren - Zeiss Universal Mikroskop Bertrandlinse - Zeiss Ultraphot microscope fungus on the Bertrand-lens - Zeiss PM III- auf der Bertrand-Linse befindet sich Pilzbefall - Zeiss Photomicroscope III RS DIC- und Phasenkontrast-Einstellung-Linse - Zeiss buy spare parts # Related URLs: - Markdown po polsku: https://www.serwismikroskopowy.pl/part/91045.md - Markdown auf Deutsch: https://www.mikroskopteile.de/part/91045.md - Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/91045-zeiss-photomicroscope-universal-microscope-bertrand-lens-for-dic-and-phase-contrast-alignment-spare-part-for-photo - Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/91045.media.md - Representative photo: https://www.microscopeparts.eu/photo/zeiss-photomicroscope-universal-microscope-bertrand-lens-for-dic-and-phase-contrast-alignment-spare-part-for-photo-91045-2 - Representative video: https://www.microscopeparts.eu/play/91045-1 - Other parts from category Lenses: https://www.microscopeparts.eu/lenses - More Lenses removed from microscope Zeiss Photomicroscope: https://www.microscopeparts.eu/lenses/from/zeiss/photomicroscope - More Lenses compatible with microscope Zeiss Photomicroscope: https://www.microscopeparts.eu/lenses/for/zeiss/photomicroscope - More Lenses removed from microscopes Zeiss: https://www.microscopeparts.eu/lenses/from/zeiss - More Lenses compatible with microscopes Zeiss: https://www.microscopeparts.eu/lenses/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: 2026-09-20