# Part name: Leitz Wetzlar 512821/20 microscope interpupillary adjustment mechanism for binocular head # Original page URL: https://www.microscopeparts.eu/part/leitz-dialux-20-wetzlar-512821-20-microscope-interpupillary-adjustment-mechanism-for-binocular-head-99929 # Part manufacturer: Leitz # Full manufacturer name: Leitz Wetzlar # Other names of this manufacturer: - Leitz Wetzlar, West Germany - E. Leitz Wetzlar GmbH - Ernst Leitz Wetzlar 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: Internal interpupillary distance adjustment mechanism for the Leitz Wetzlar 512821/20 microscope binocular head and similar heads. The set offered here consists of: - two brass carrier plates, each with a round seat for the eyepiece tube (it is to these plates that the tubes https://www.microscopeparts.eu/part/99928 are screwed) - a central scissor lever made of plastic, with its fixing screw - two pressure springs (one for each brass plate) Turning the central lever moves both brass plates outwards symmetrically. It is exactly this constant work of the plastic central lever against the brass plates that wears the plastic lever out - and then it has to be replaced. This mechanism was removed from the Leitz Wetzlar binocular head P/N 512821/20 (also written 512 821) - but exactly the same one is used in other models of binocular and trinocular heads as well. The same front panel design is found in, among others, the Leitz 512 923/20 and Leitz 512 815 trinocular heads - this interpupillary mechanism will most likely fit those too. From the outside this mechanism is covered by plastic covers - one on the right (https://www.microscopeparts.eu/part/99931) and a different one on the left (https://www.microscopeparts.eu/part/99930). These plastic covers carry a printed scale on which the interpupillary distance is read. Before you decide to use this mechanism in a Leitz Wetzlar head other than model 512 821/20, first compare the exact dimensions (the photos show a millimetre scale), and if you have any doubts, ask in internet groups and forums. This is a service part for a microscope head - not for a specific microscope model. Such a head can be mounted on many Leitz Wetzlar microscope models (and even on microscopes from other makers), so no list of microscopes this mechanism fits can be given - it fits the head, and the user mounts the head wherever he wants. In the "compatibility" section I list a few example Leitz Wetzlar microscope models that turn up on the second-hand market complete with the head this mechanism comes from - but this is definitely not a complete list. They include: - Leitz Wetzlar Dialux 20 / Dialux 22 EB - Leitz Wetzlar Laborlux K / Laborlux S - Leitz Wetzlar Diaplan On the last photos in the gallery you can see the Leitz Wetzlar 512821/20 binocular head, and with arrows I try to show which part this is and where it sits in the head. # Examples of use - as a service part in the form of a complete module, if this part in your microscope head has been damaged - as a source for the central scissor lever, which, being a plastic part, often wears out or breaks # Removed from microscope: Leitz Dialux 20 # Also compatible with the following microscopes: - Leitz Wetzlar 512821/20 binocular - Leitz Dialux 20 - Leitz Laborlux S - Leitz Diaplan - Leitz Wetzlar Laborlux - Leitz Wetzlar HM-Lux - Dialux 22 EB - Leitz Wetzlar Laborlux K # Names, descriptions, terms, and search contexts under which this part is searched. - Leitz Dialux 20 microscope repair parts - keywords Leitz 512821/20 Augenabstand-Verstellung Binokularkopf - Leitz 512 821 interpupillary adjustment mechanism replacement - Leitz Dialux 20 Augenabstand lässt sich nicht verstellen - Leitz Dialux 22 EB binocular head interpupillary mechanism - Leitz Laborlux S Scherenhebel Kunststoff gebrochen - Leitz Laborlux K binocular head eye distance lever broken - Leitz Diaplan Augenabstand-Verstellmechanismus Ersatzteil - Leitz 512 815 trinocular head interpupillary mechanism - Leitz Bino Augenabstand wackelt - Verstellung ausgeschlagen - Leitz binocular head will not hold eye distance setting - Leitz Ortholux Binokularkopf Augenabstand Mechanik - Leitz SM-LUX Bino Messing-Trägerplatten Okularstutzen - Leitz Laborlux 12 binocular head repair DIY interpupillary - Leitz Ortholux Binokularkopf aufarbeiten Augenabstand-Mechanik - mechanismus nastavení očního rozestupu binokulární hlavice Leitz - mecanismo de distancia interpupilar cabezal binocular Leitz Dialux - palanca de ajuste interpupilar cabezal binocular Leitz Laborlux - meccanismo distanza interpupillare testata binoculare Leitz Dialux - leva di regolazione interpupillare testata binoculare Leitz Laborlux - mechanizm rozstawu źrenic do głowicy Leitz - wymiana - Leitz buy spare parts # Related URLs: - Markdown po polsku: https://www.serwismikroskopowy.pl/part/99929.md - Markdown auf Deutsch: https://www.mikroskopteile.de/part/99929.md - Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99929-leitz-dialux-20-wetzlar-512821-20-microscope-interpupillary-adjustment-mechanism-for-binocular-head - Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99929.media.md - Representative photo: https://www.microscopeparts.eu/photo/leitz-dialux-20-wetzlar-512821-20-microscope-interpupillary-adjustment-mechanism-for-binocular-head-99929-2 - Representative video: https://www.microscopeparts.eu/play/99929-1 - Other parts from category Service and spare parts: https://www.microscopeparts.eu/service-and-spare-parts - More Service and spare parts removed from microscope Leitz Dialux 20: https://www.microscopeparts.eu/service-and-spare-parts/from/leitz/dialux-20 - More Service and spare parts compatible with microscope Leitz Dialux 20: https://www.microscopeparts.eu/service-and-spare-parts/for/leitz/dialux-20 - More Service and spare parts removed from microscopes Leitz: https://www.microscopeparts.eu/service-and-spare-parts/from/leitz - More Service and spare parts compatible with microscopes Leitz: https://www.microscopeparts.eu/service-and-spare-parts/for/leitz # 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: 2026-10-22