Zeiss Microscope Photomicroscope Filter Selector Assembly with 5 Filters

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Zeiss Photomicroscope 3 III PM3 Filter Selector Assembly

5 Filters
* Neutral density filter 0.3 (46 78 42)
* Neutral density filter 0.1 (46 78 41) MISSING
* Neutral density filter 0.5 (46 78 40)
* Neutral density filter 0.5
* Green filter VG 9 (46 78 05)
* Blue conversion filter for photography on daylight film (46 78 50)

If you want to use several filters at a time, push the corresponding buttons simultaneously. The black pushbutton is the OFF-switch.

With the neutral density filters the transmittande can be graded at a ratio of 2:1. The transmittance of a filter combination is determined by multiplication; two neutral density filters, for example, have a transmittance of 0.5 x 0.5 = 0.25