Baader CMOS H-alpha / O-III / S-II f/2 2" x 2mm Ultra High Speed Filter Set - premium grade - with 2" screw thread (M48) 3.5/4nm FWHM (to harmonize the exposure time of H-alpha with O-III/S-II), recommended for...
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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