# Part name: Carl Zeiss Jena CF-250 Fototubus - Jenamed / Jenaval microscope Bertrand lens | internal mechanism with knob # Original page URL: https://www.microscopeparts.eu/part/carl-zeiss-jena-cf-250-fototubus-jenamed-jenaval-microscope-bertrand-lens-internal-mechanism-with-knob-99122 # Part manufacturer: Carl Zeiss Jena # Full manufacturer name: VEB Carl Zeiss Jena DDR (former East Germany) # Other names of this manufacturer: - ausJena - aus Jena 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: Housings and its parts # Description and specifications: Complete mechanism for operating the Bertrand lens. The lens is located inside the photo tube of Carl Zeiss Jena microscopes of the CF-250 series. - assembly of two lenses - knob for moving and shifting the lenses - mechanism for moving and shifting the lenses Metal, cast or injection-molded parts manufactured by Carl Zeiss Jena have their own identification numbers. In this mechanism the lens is mounted on a cast part marked with number 2582 (full marking: Si10 CZ 2582). This is a service element (repair part) of the trinocular head (photo tube), suitable for Carl Zeiss Jena microscopes of the CF-250 series. Please note that this is an element (component) of a microscope part (German: "Fototubus") and not a part dedicated to a specific microscope model. Carl Zeiss Jena microscopes of the CF-250 series have a modular design and the microscope part to which the eyepieces are mounted (commonly referred to as "head", "binocular" or "twin tube") is a separate element from the angle tube (sometimes the German term "Winkeltubus" is used). If the angle tube has a photographic output, it is referred to as a "photo tube". The Bertrand lens offered and described here is intended specifically for this microscope part. Hinweis - Carl Zeiss Jena microscopes Jenapol and Jenatech, although they also belong to the CF-250 series, have a differently designed photographic output and this mechanism DOES NOT FIT these models. Hinweis - Carl Zeiss Jena also produced a simplified version of the photo tube which does not contain a Bertrand lens inside. In the image gallery there is also a page from the manufacturer's catalog so that it is visible whether these versions differ externally in appearance. This Bertrand lens shown and offered here CANNOT be installed in such a simplified version of the photo tube. The photos visible in the gallery show the exact dimensions of the element described and offered here. Additionally, in the last photo an arrow indicates which element is concerned and where it is located in the head, in order to clearly identify this part. In common usage many names are used for the photo tube. It is worth listing them here - each of them refers to the same microscope part. - photo head - trinocular head - trinocular microscope head - trinocular head assembly - photo dome - inclined tube with photo output # Examples of use - as a service part for replacing the entire element if this mechanism or any of its components in your microscope is damaged or in very poor condition # Removed from: Carl Zeiss Jena CF-250 Fototubus # Also compatible with the following microscopes: - Carl Zeiss Jena CF-250 Fototubus - Carl Zeiss Jena Jenamed - Carl Zeiss Jena Jenaval - Carl Zeiss Jena Jenalumar - Carl Zeiss Jena Jenavert - Carl Zeiss Jena Jenamed-2 - Carl Zeiss Jena Jenamed Fluorescence # Names, descriptions, terms, and search contexts under which this part is searched. - Carl Zeiss Jena CF-250 Fototubus microscope repair parts - Carl Zeiss Jena Jenamed Mikroskop Trinokular Bertrand Linse - Zeiss Jenaval Fotokopf Phasenkontrast Okular - Jenalumar microscope photo adapter Bertrand lens - Zeiss Jenamed microscope trinocular head phase contrast telescope eyepiece - Carl Zeiss Jena buy spare parts # Related URLs: - Markdown po polsku: https://www.serwismikroskopowy.pl/part/99122.md - Markdown auf Deutsch: https://www.mikroskopteile.de/part/99122.md - Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99122-carl-zeiss-jena-cf-250-fototubus-jenamed-jenaval-microscope-bertrand-lens-internal-mechanism-with-knob - Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99122.media.md - Representative photo: https://www.microscopeparts.eu/photo/carl-zeiss-jena-cf-250-fototubus-jenamed-jenaval-microscope-bertrand-lens-internal-mechanism-with-knob-99122-2 - Representative video: https://www.microscopeparts.eu/play/99122-1 - Other parts from category Housings and its parts: https://www.microscopeparts.eu/housings-and-its-parts - More Housings and its parts removed from microscope Carl Zeiss Jena CF-250 Fototubus: https://www.microscopeparts.eu/housings-and-its-parts/from/carl-zeiss-jena/cf-250-fototubus - More Housings and its parts compatible with microscope Carl Zeiss Jena CF-250 Fototubus: https://www.microscopeparts.eu/housings-and-its-parts/for/carl-zeiss-jena/cf-250-fototubus - More Housings and its parts removed from microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/housings-and-its-parts/from/carl-zeiss-jena - More Housings and its parts compatible with microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/housings-and-its-parts/for/carl-zeiss-jena # 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