# Part name:
Carl Zeiss Jena Lu microscope condenser holder with oblique illumination sliding iris diaphragm

# Original page URL:
https://www.microscopeparts.eu/part/carl-zeiss-jena-lu-microscope-condenser-holder-with-oblique-illumination-sliding-iris-diaphragm-99488

# 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:
Iris diaphragms

# Description and specifications:
Condenser holder module with a laterally movable iris diaphragm for obtaining DIC-like oblique illumination in the Carl Zeiss Jena Lu microscope (from the L-Stand family).

The Carl Zeiss Jena Lu microscope features a modular design (the same as the larger Carl Zeiss Jena Nf microscope). This microscope part (this module) consists of the following components:
- dovetail mounting with a clamping screw for attachment to the condenser lifting block
- condenser holder with a retaining screw for securing the condenser
- iris diaphragm (aperture diaphragm)
- iris diaphragm sliding carriage allowing lateral movement of the diaphragm
- eccentric mechanism allowing rotation of the carriage, making it possible to illuminate not only from the sides but also from the front or rear
- spring plate (lock) allowing the entire diaphragm assembly to be moved out of the optical path

The condenser holder has an internal mounting clamp for condensers with a diameter of 39.5 mm.

The movable iris diaphragm mounted below the microscope condenser allows oblique illumination and produces a three-dimensional image effect that increases the contrast of transparent specimens (for example individual unstained cells). This provides an effect similar to Differential Interference Contrast (DIC).

Various names are used on the secondary market for this microscope part, including:
- decenterable iris diaphragm
- decentering aperture diaphragm
- off-axis iris diaphragm
- eccentric iris diaphragm
- sliding iris diaphragm
- sliding iris
- oblique illumination condenser
- condenser with sliding iris
- oblique illumination module
- oblique illumination diaphragm
- offset iris
- Poor Man's DIC device

Note - this condenser module DOES NOT FIT Carl Zeiss Jena Nf, Ng, Lumipan, Polmi-A or Nu microscopes, even though the mounting arrangement appears very similar at first glance.

# Examples of use
- if you own a Carl Zeiss Jena Lu microscope that is missing this complete module
- if this microscope part is damaged or in very poor condition
- if you would like to install this diaphragm on another microscope
- if you need a movable iris diaphragm for your own DIY project

# Removed from microscope:
Carl Zeiss Jena Lu

# Also compatible with the following microscopes:
Carl Zeiss Jena Lu

# Names, descriptions, terms, and search contexts under which this part is searched.
- Carl Zeiss Jena Lu microscope repair parts
- Carl Zeiss Jena Lu Mikroskop Kondensorhalter
- Zeiss Jena Lu Schiefes Licht Einrichtung
- Zeiss Jena Lu Mikroskop DIK-Ähnlich Schlaglicht
- Carl Zeiss Jena Lu microscope DIC-like oblique illumination
- Zeiss Jena Lu L-Stativ microscope condenser holder
- uchwyt kondensora mikroskopu Carl Zeiss Jena Lu
- Carl Zeiss Jena buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99488.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99488.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99488-carl-zeiss-jena-lu-microscope-condenser-holder-with-oblique-illumination-sliding-iris-diaphragm
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99488.media.md
- Representative photo: https://www.microscopeparts.eu/photo/carl-zeiss-jena-lu-microscope-condenser-holder-with-oblique-illumination-sliding-iris-diaphragm-99488-2
- Representative video: https://www.microscopeparts.eu/play/99488-1
- Other parts from category Iris diaphragms: https://www.microscopeparts.eu/iris-diaphragms
- More Iris diaphragms removed from microscope Carl Zeiss Jena Lu: https://www.microscopeparts.eu/iris-diaphragms/from/carl-zeiss-jena/lu
- More Iris diaphragms compatible with microscope Carl Zeiss Jena Lu: https://www.microscopeparts.eu/iris-diaphragms/for/carl-zeiss-jena/lu
- More Iris diaphragms removed from microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/iris-diaphragms/from/carl-zeiss-jena
- More Iris diaphragms compatible with microscopes Carl Zeiss Jena: https://www.microscopeparts.eu/iris-diaphragms/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