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 F1.4 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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