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ISO 8577:1997 Optics and optical instruments -- Microscopes -- Spectral filters
standard by International Organization for Standardization, 08/01/1997
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This International Standard specifies recommended diameters to allow the interchangeability of spectral filters used in microscopes, as well as permissible filter material defects and processing faults.
This International Standard differentiates between two forms of spectral filters:
Form A: Filters to be used both in the observation light path and in the illumination light path;
Form B: Filters to be used solely in the illumination light path.