The Pentax DA★ 55mm F1.4 SDM sounds like a nifty fifty, but it’s actually designed for Pentax’s APS-C DSLRs, like the new Pentax KF (which is the camera we used to test it). On an APS-C camera, its focal length is equivalent to 84.5mm, so really this is a portrait lens.
The star in the name indicates one of Pentax’s premium quality lenses, and the ‘SDM’ denotes a Supersonic Drive Motor built into the lens itself. This should give it smoother, faster operation than the body-based motor used for many other Pentax lenses.
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