OPT Radian Triad Ultra Quad-Band Narroband Filter The Triad filter has now been improved! With Triad Ultra, you now have narrower bandpasses, more light pollution reduction, higher contrast, better separation...
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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