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Overview: The Sony SAL30M28 is a small, lightweight wide
lens that features a large aperture (f/2.8) and fixed focal length of 30mm (APC-C
35mm equivalent of 45mm) which makes it ideal for portrait shots, as well as
close up photography.
DT Lens Design: The DT Lens is a compact, lightweight lens designed
specifically for the APS-size CCD imager used in most Sony Alpha-series DSLR
Note: DT lenses are not recommended for use with the Sony
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 focus (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.
Manual Focus: To focus manually using this auto-focus lens, set the camera
body to manual focus and adjust the focus ring on the lens. The shooting
distance scale, located on the barrel of the lens, is graduated in inches and
feet as well as
meters from 5.1" (0.129m) to infinity. For accurate manual focusing, look
through the viewfinder while rotating the focusing ring.
Flash Precautions: When using a built-in camera flash, you
will have to shoot from at least 1 meter (3.3') away from your subject. With
certain lens/flash combinations, the lens may partially block the light of the
flash, resulting in a shadow at the bottom of the picture. To
prevent the shadows from appearing, use of a Ring Light, Macro Twin Flash kit,
or a Macro Light Adapter is recommended.
Vignetting: When you use the lens, the corners of the screen may
become darker than the center. To reduce this phenomena (called vignetting), you
should close the aperture by 1-2 stops.