Baader CMOS H-alpha f/2 2" x 2mm ultra high speed filter - premium grade - with 2" screw thread (M48) 3.5nm FWHM (to harmonize shutter speed with O-III/S-II), recommended for extremely fast optical systems faster...
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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