# Part name:
Carl Zeiss Jena NU / Amplival M19 Planachromat 25x/0,50 oo/0,17 microscope objective

# Original page URL:
https://www.microscopeparts.eu/part/carl-zeiss-jena-nu-amplival-m19-planachromat-25x-0-50-oo-0-17-microscope-objective-99047

# 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:
Objective

# Description and specifications:
Biological microscope objective Carl Zeiss Jena Planachromat 25x with M19 thread for infinity-corrected systems.

Basic parameters:
- Element: biological microscope objective
- Manufacturer: Carl Zeiss Jena
- Designation: Planachromat 25x/0,50 oo/0,17
- Magnification: 25x
- Numerical aperture N.A.: 0,50
- Optical correction: infinity-corrected tube length
- Optical correction class: planachromat
- Cover glass: yes, 0.17 mm
- Thread: M19

Some facts about Carl Zeiss Jena objectives with M19 thread (CZJ M19) and their compatibility with various microscopes from this manufacturer:
- these objectives are most commonly used for technical applications rather than biological applications, therefore most objectives available on the secondary market are intended for use without a cover glass (designation oo/0)
- CZJ M19 objectives intended for biological applications (designation oo/0,17) are most commonly used on Carl Zeiss Jena NU / NU2 microscopes
- in Carl Zeiss Jena Nf and Lumipan microscopes, CZJ M19 objectives are used together with an EPI illuminator
- CZJ M19 objectives can be used in Carl Zeiss Jena Polmi-A microscopes, but they provide a different magnification than the nominal value
- Carl Zeiss Jena Amplival / Amplival Pol / Amplival Interphako / Peraval microscopes feature interchangeable nosepieces, and a dedicated nosepiece for M19-thread objectives was also produced for these microscopes
- Carl Zeiss Jena Metaval and Neophot microscopes use newer versions of CZJ M19 objectives (with a coarse-knurled edge and shiny housing), although many users still experiment with older M19 objectives on these microscopes
- Carl Zeiss Jena Epignost and BK 70x50 microscopes were produced in various versions with completely different configurations - and some of them operate with CZJ M19 objectives
- Carl Zeiss Jena Vertival / Epival / Nf / BK 70x50 microscopes often allow the use of CZJ M19 objectives in EPI dark-field mode
- on the Carl Zeiss Jena Epityp-2 inverted metallurgical microscope, many users employ biological objectives designed for use with a cover glass, placing the microscope slide "upside down", with the cover glass facing downward toward the objective.

# Examples of use
- if you need an objective with this magnification for one of the microscopes with which it is compatible (additional information can be found in the description)

# Removed from microscope:
Carl Zeiss Jena NU

# Also compatible with the following microscopes:
- Carl Zeiss Jena NU
- Carl Zeiss Jena NU-2
- Carl Zeiss Jena Amplival
- Carl Zeiss Jena Vertival
- Carl Zeiss Jena Lumipan
- Carl Zeiss Jena Nf
- Carl Zeiss Jena Epival
- Carl Zeiss Jena Polmi A
- Carl Zeiss Jena BK 70x50
- Carl Zeiss Jena Epignost
- Carl Zeiss Jena Epityp-2
- Carl Zeiss Jena Metaval
- Carl Zeiss Jena Neophot 21
- Carl Zeiss Jena Amplival Pol
- Carl Zeiss Jena Amplival Interphako
- Carl Zeiss Jena Peraval

# Names, descriptions, terms, and search contexts under which this part is searched.
- Carl Zeiss Jena NU microscope repair parts
- Carl Zeiss Jena infinity microscope objective
- Carl Zeiss Jena M19 thread microscope objective
- Carl Zeiss Jena M19 Gewinde Mikroskopobjektiv
- Zeiss Jena Mikroskopobjektiv für unendlich korrigierte biologische Systeme
- Carl Zeiss Jena buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99047.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99047.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99047-carl-zeiss-jena-nu-amplival-m19-planachromat-25x-0-50-oo-0-17-microscope-objective
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99047.media.md
- Representative photo: https://www.microscopeparts.eu/photo/carl-zeiss-jena-nu-amplival-m19-planachromat-25x-0-50-oo-0-17-microscope-objective-99047-2
- Representative video: https://www.microscopeparts.eu/play/99047-1
- Other parts from category Objective: https://www.microscopeparts.eu/objective
- More Objective removed from microscope Carl Zeiss Jena NU: https://www.microscopeparts.eu/objective/from/carl-zeiss-jena/nu
- More Objective compatible with microscope Carl Zeiss Jena NU: https://www.microscopeparts.eu/objective/for/carl-zeiss-jena/nu
- More Objective removed from microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/objective/from/carl-zeiss-jena
- More Objective compatible with microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/objective/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