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Focus Type
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inner focus, Smooth Autofocus Motor (SAM): The built-in Smooth Autofocus Motor (SAM) eliminates the need to use a mechanical coupling system in the camera body to transfer auto foucs (AF) drive power and control signals to the lens. Instead, AF control signals from the camera body are sent to the lens-mounted SAM unit, which drives the focusing lens group directly, helping to assure smooth AF response.
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