A microscope is modified to allow for precise imaging of samples using different filters at different focal planes under computer control. A filter accessory includes a filter disc having bandpass filters. The filter disc may be rotated to move a selected filter into the optical path between a light...http://www.google.com/patents/US5009488?utm_source=gb-gplus-sharePatent US5009488 - Filter accessory for an imaging microspectrofluorimeter
