2" x 2mm Ultra Narrowband (Narrow Band) Baader CMOS S-II Filter - Premium Grade - with 2" (M48) Screw Thread 4nm FWHM, recommended for optical systems slower than f/3.4 Enables the highest contrast even in the...
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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