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SAL85F28 Excellent Contrast Reproduction Precision optical design to provide high contrast from image center to periphery. Smooth Backgrounds The combination of large F2.8 aperture and circular aperture design delivers smooth, natural defocusing effects SAM (Smooth Autofocus Motor) Autofocus signals received from the camera body control a motor built into the lens. The internal motor directly drives the focusing group for smooth autofocus operation.