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Description of this part for the microscope.

diffuser)
- blue
- yellow
- green

New (usually Chinese) microscope filters are sometimes not even made of glass. And even if they are made of glass - you may encounter scandalous examples where the glass is only surface-colored. Unfortunately, cheap colored glass filters may not be internally homogeneous and can cause light refraction distortions.

This filter set by PZO was originally sold together with the PZO Biolar microscope. It was manufactured in the 1970s (and certainly before 1977), so these are optical glasses that are about half a century old! They have never been used until now (this is so-called NOS - New Old Stock), therefore these are excellent old-class optical glasses of the highest quality.

Filters with a 32 mm diameter are used - and can be used - in microscopes from various manufacturers:
- Carl Zeiss Jena
- Zeiss West Germany
- Eschenbach
- Meopta
- Nikon
- ROW
- Leitz Wetzlar
- Wild
- Hund
- Kosmos
- and many others

Important - popular microscopes by Lomo (for example Lomo Biolam) have a 33 mm filter holder, so the filters shown here have too small a diameter and may fall out from some Lomo holders.

Description of this part for the microscope.

inside the microscope base. It includes a mechanism that allows these filters to be inserted into or removed from the light path using control buttons. Since more than one filter can be placed in the light path at the same time, the mechanism also includes an additional (seventh) button that removes all filters from the light path simultaneously. Because of this seventh button, some descriptions incorrectly state that the microscope base contains seven filters.

The following filters are installed in this filter cassette:
- NCB filter (blue conversion filter that transforms yellow incandescent lamp light into naturally white light), Zeiss P/N 46 78 50 (yellow stripe on the push button)
- VG 9 green filter, Zeiss P/N 46 78 05 (green stripe on the push button)
- two neutral density filters 0.5, Zeiss P/N 46 78 40 (light grey stripes on the push button)
- neutral density filter 0.12, Zeiss P/N 46 78 41 (grey stripe on the push button)
- neutral density filter 0.03, Zeiss P/N 46 78 42 (dark grey stripe on the push button)

Combinations of the neutral density filters provide stepwise light transmission values ranging from 1.5% to 100%.

Each of these filters can be removed from its holder, resulting in a standard 32 mm round microscope filter that can also be used in microscopes made by other manufacturers. In addition, any other 32 mm round filter can be installed in this filter cassette, allowing the filter set of the microscope to be configured freely.

This filter cassette with its complete control mechanism fits all versions of Carl Zeiss Photomicroscope microscopes (also known as Zeiss PM or Zeiss Phomi) as well as Zeiss Universal microscopes. However, there are also some less common variants of the Zeiss Universal that do not include this filter mechanism inside the microscope base. Importantly, the Carl Zeiss Ultraphot microscope does not use this component.

The last photographs in the gallery indicate with an arrow exactly which component is being offered and where it is located inside the microscope. This allows unambiguous identification of the part.