Pentax SMC (Super-Multi-Coated) lenses were introduced in the early 1970s, at the end of the M42-mount era, when it was launched with the introduction of Pentax K-mount lenses. Though not designated officially as the K-series, the lenses are usually given this designation to distinguish them from later K-mount lenses (such as the M, A, F, FA, and DA series). K-mount lenses were exclusively manual focus lenses with no electronic features.
The K-series was followed by the manual focus M-series which is again without any electronic features, though they are generally smaller in size to match the more compact bodies of the Pentax M-series 35mm SLR film camera bodies that were being produced then. The A series of lenses saw the introduction of "automatic" aperture settings. The lenses had an aperture ring that could be set manually, and a click-button "A" mode setting which allowed the camera to control the aperture automatically.
Like all A-series lenses, this very fast standard lens supports P and Tv exposure modes in addition to Av and M and is adaptable to all K-mount Pentax SLR cameras, including digitals. It is slightly softer at 1:1.4 but reaches very good figures from 2.8 downward. The lens is also recommended for portrait photography on digital cameras and produces images that are soft with smooth out-of-focus blurring.
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