85mm F2.8 SAM Prime Lens

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.
85mm F2.8 SAM Prime Lens

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.

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Lens Type Standard & Medium Telephoto
Lens Mount Type Sony A-mount
Aperture f/2.8
Aperture (Max.) f/2.8
Aperture (Min.) f/22
Focal Length (35mm equivalent) 127.5 mm
Filter Diameter 55 mm
Lens Groups-Elements 4 groups, 5 elements
Minimum Focus Distance 24" (0.6m)
Angle of View 29° (35mm), 19° (APS-C)
Aperture Blade 7 blades (Circular aperture)
Distance Encoder Yes
Distance Scale Yes
Internal Motor Yes (SAM)
Lens Weight 6.1 oz (175g)
Maximum Magnification x 0.2
Weights and Measurements
Weight (Approx.) 6.1 oz (175g)

  • Front and rear lens cap
  • ALC-SH111 solid-circular lens hood