32mm Microscope Darkfield Oblique and Special Effects Filters

Description

The available filters are shown in the attached picture,
please notice above every darkfield filter is shown the diameter of the center stop. Material approx. 1.5mm Delrin.
The overall diameter is made to be inserted in a condenser tray featuring the above advertised insertion diameter. This set is custom made to fit a large range of microscope and optical devices and is not a brand name.
In oblique illumination, direct light is restricted to a single azimuth, striking the specimen from only one direction rather than bathing it with an even distribution of light. The net effect is to reveal details in pseudo-relief to produce a shadowed effect on the side opposite the light source and bright specimen highlights on the side nearest the illuminator. You are bidding for a set of filters as shown in the attached picture.