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Description of this part for the microscope.

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this module serves as the aperture diaphragm. The field diaphragm is built into the illumination path inside the microscope base.

At the same time, it provides a holder for 32 mm round filters. The video available in the gallery also demonstrates how a filter is inserted into this holder.

The sliding iris diaphragm mounted beneath the microscope condenser allows oblique illumination to be set, producing a three-dimensional image with enhanced contrast of transparent specimens (such as unstained cells). The resulting image is similar to differential interference contrast (DIC).

This component is known under various names, 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 diaphragm DOES NOT FIT the Carl Zeiss Jena Lumipan microscope, even though it appears very similar at first glance.

Because this module is removable, it is missing from a large proportion of microscopes available on the second-hand market. During decades of use, these diaphragm modules were frequently lost.

In addition, they are often damaged and need replacement. The most common failures include:
- the protective glass covering the diaphragm becomes scratched or broken
- the diaphragm blades become bent or broken
- the screw used to decenter the diaphragm bends or breaks
- the return spring responsible for restoring the diaphragm to its centred position becomes damaged or is missing

Replacing the damaged assembly with the diaphragm module offered here solves these problems.