# Part name:
Carl Zeiss Jena Ergaval / Amplival microscope coarse focus knobs

# Original page URL:
https://www.microscopeparts.eu/part/carl-zeiss-jena-ergaval-amplival-microscope-coarse-focus-knobs-99310

# 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:
Service and spare parts

# Description and specifications:
Microscope knob for coarse movement (macro focus).

Such knobs are used in the following microscopes:
- Carl Zeiss Jena Ergaval
- Carl Zeiss Jena Amplival (and its variants: Fluoval, Epival, Vertival)
- Carl Zeiss Jena Metaval
- Carl Zeiss Jena Docuval

Both the left and the right knob are identical, but when installing be careful about the screw length, as they may differ).

VERY IMPORTANT: although the right and left knobs are identical - different screws are used to attach them.

Lengths of screws used to attach the knobs in Carl Zeiss Jena Ergaval and Amplival microscopes:
- left fine adjustment knob (micro): 1 pc. screw 12 mm
- left coarse adjustment knob (macro): 3 pcs. screws 8 mm
- right fine adjustment knob (micro): 1 pc. screw 16 mm
- right coarse adjustment knob (macro): 3 pcs. screws 12 mm

Over the years these plastic knobs are often damaged:
- sometimes they crack due to impact or improper transport securing
- often they are partially melted by a soldering iron, light bulb or even a cigarette
- sometimes they are damaged during attempts to remove them

# Examples of use
- as service spare part

# Removed from microscope:
Carl Zeiss Jena Ergaval

# Also compatible with the following microscopes:
- Carl Zeiss Jena Ergaval
- Carl Zeiss Jena Fluoval-2
- Carl Zeiss Jena Amplival
- Carl Zeiss Jena Docuval
- Carl Zeiss Jena Vertival
- Carl Zeiss Jena Epival
- Carl Zeiss Jena Metaval
- Carl Zeiss Jena Fluoval

# Names, descriptions, terms, and search contexts under which this part is searched.
- Carl Zeiss Jena Ergaval microscope repair parts
- Carl Zeiss Jena Ergaval Mikroskop Grobtrieb Drehknöpfe
- Carl Zeiss Jena Amplival Bedienrad
- Zeiss Docuval Grobtrieb Knöpfe
- Zeiss Jena Metaval Makrotrieb
- Carl Zeiss Jena microscope coarse focus knobs
- Carl Zeiss Jena Amplival Mikroskop neufetten
- Carl Zeiss Jena microscope repair
- Carl Zeiss Jena buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99310.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99310.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99310-carl-zeiss-jena-ergaval-amplival-microscope-coarse-focus-knobs
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99310.media.md
- Representative photo: https://www.microscopeparts.eu/photo/carl-zeiss-jena-ergaval-amplival-microscope-coarse-focus-knobs-99310-2
- Other parts from category Service and spare parts: https://www.microscopeparts.eu/service-and-spare-parts
- More Service and spare parts removed from microscope Carl Zeiss Jena Ergaval: https://www.microscopeparts.eu/service-and-spare-parts/from/carl-zeiss-jena/ergaval
- More Service and spare parts compatible with microscope Carl Zeiss Jena Ergaval: https://www.microscopeparts.eu/service-and-spare-parts/for/carl-zeiss-jena/ergaval
- More Service and spare parts removed from microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/service-and-spare-parts/from/carl-zeiss-jena
- More Service and spare parts compatible with microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/service-and-spare-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