Lens manufacturers including Nikon, Minolta, and Sony make lenses designed with specific controls to change the rendering of the out-of-focus areas.
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An adapter for the K-mount lenses has been announced (ED-MA9NXK) by Samsung, and various adapters are produced by Novoflex to adapt lenses made for Nikon F-mount, Canon FD lens mount, Minolta SR mount, Minolta AF, Sony A-mount, Leica R bayonet, Pentax K-mount, Olympus OM system, M42 lens mount, and T2 mount.
The Sony Alpha a550 incorporates Sony's patented SteadyShot INSIDE stabilisation system which works with any attached lens.
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The Sony Alpha a550's main selling point is its dual Live View mode's, Sony's normal secondary; smaller sensor based Live View mode and another which uses the main sensor with no autofocus.
The Sony Alpha a550 is "big brother" to the Sony Alpha a500, an almost identical DSLR with a smaller 12.3 megapixel APS-C CMOS sensor, no 7frame/s continuous shooting and a lower resolution LCD.