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The Pentax K-mount, sometimes referred to as the "PK-mount", is a bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, [ 1 ] and has since been used by all Pentax 35 mm and digital SLRs and also the MILC Pentax K-01 .
Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...
A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific eye. The symbols on an acuity chart are formally known as "optotypes". Variation of Snellen chart with another letter ...
First K-mount version A-position, electrical contacts Screw drive, with contacts for serial communication Two contacts for Powerzoom Aperture ring abandoned Small image circle In lens autofocus motor electromagnetic aperture control K (K-series, M-series, LX) M, Av M, Av M, Av M, Av X X X X KA (A-series, P-series) M, Av M, Av, Tv, P M, Av, Tv, P
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