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The Zeiss Sharp Max is a back-focus alignment device designed for 2/3" SD and HD B4-mount lenses, especially Zeiss's series of DigiZooms and DigiPrimes. Eliminating the need to move the camera or light a chart, the Sharp Max allows precise back-focus calibration by simply attaching it to the lens, pushing the power button, and adjusting the back-focus ring to the center of the illuminated Siemens star. The unit's athermal design means accurate alignment even in extreme temperatures. A set of 9 adapter rings is included (80mm - 130mm), allowing for alignment of most B4-mount lenses.