Product description: Optolong UBVRI photometric filter set - in frame This UBVRI photometric filter set consists of five 1.25" or 2" round frame filters: Ultrabed (U), Blue (B), Visual (V), Red (R), and Infrared...
IMPORTANT ANNOUNCEMENT !! When a filter is used between the corrector and the camera the working distance will increase to 1/3 of the thickness of the filter. if a 2mm filter is used it will increase approximately 650 microns, 0.65mm
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