From the Manufacturer
DT 30mm F2.8 SAM Macro Lens
With a macro lens, you gain entry to another dimension. Focus on close-up objects with 1:1 life-size imaging with the SAL35M28 macro lens with a built-in Smooth Autofocus motor. With a 35mm equivalent of 45mm, this macro lens makes it easy to transform the everyday details of life into photographic works of art, ideal for close-up and portrait shots.
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.
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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Get incredibly close to small subjects. Ideal for close-up and portrait shots, the 30mm f/2.8 Lens
allows you to focus on close-up objects with 1:1 life-size imaging. In addition to a built-in Smooth Autofocus motor, this macro lens makes it easy to transform the everyday details of life into photographic works of art.