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For a long time it was quiet about the catadioptric lenses, because the diameter of the primary mirror divided into the focal length. They have a central obstruction means they cannot use an adjustable diaphragm to control light transmission. This means the lens’s F-number value is fixed to the overall designed focal ratio of the optical system. Two weeks ago …
Read More »Tokina SZX 400mm f/8 Reflex MF Catadioptric Telephoto Lens: Pre-order Open
