ZWO EFW 5 X 2"Compatible filters 5 x 2" mounted Ports USB Power draw 120 mA @ 5A Power supply USB cable Maximum thickness of the filter 7. 5 mm (not including threads which must be less than 2. 7 mm) Optical thickness 20 mm Camera connection Direct screw connection to camera with tilt plate removed, M54 x 0. 75 Telescope connection M54 x 0. 75 female Camera compatibility APS C and larger ASI cooled cameras or cameras with a male M54 x 0. 75 thread or compatible