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Sony Alpha SAL85F28 85mm f/2.8 A-mount Standard & Medium Telephoto Fixed Lens (Black)
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About Sony Alpha SAL85F28 85mm F/2.8 A-mount Standard
From the Manufacturer 85mm F2.8 SAM Prime Lens This lightweight, compact lens offers an 85mm medium telephoto focal length on 35 mm full-frame cameras, and a 127.5 mm equivalent telephoto focal length on APS-C format Interchangeable-lens digital cameras. Color aberration is minimal, and contrast and resolution are excellent even at maximum F2.8 aperture. Technology Circular Aperture When changing your aperture to defocus the background, the light sources appear blurred. This ‘bokeh’ effect of the blurred background can be enhanced with circular aperture blades used in this lens. Conventional aperture blades have flat sides creating unappealing polygonal shaped defocussed points of light. α lenses overcome this problem through a unique design that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed by 2 stops. Smoother, more natural defocusing can be obtained as a result. Distance encoder The distance encoder plays an integral part in ADI flash metering, which delivers high precision flash metering that is unaffected by the reflectance of subjects or backgrounds. The distance encoder is a lens component that directly detects the position of the focusing mechanism, and sends a signal to the CPU in order to measure distance to the subject. During flash photography, this data is very useful in calculating how much flash output is appropriate to the scene. SAM (Smooth Autofocus Motor) Rather than using the focus drive motor in the camera body, SAM lenses feature an autofocus motor built into to the lens itself that directly drives the focusing element group. Since the built-in motor directly rotates the focus mechanism, operation is significantly smoother and quieter than conventional coupled autofocus drive systems. 2010 Sony Electronics, Inc. All rights reserved. Sony, the Sony logo, Alpha, “α” and Super SteadyShot are trademarks of Sony. All other trademarks are trademarks of their respective owners.
