The Pentax K Mount is a widely adopted, standardized Bayonet mount introduced by Pentax in 1975. It is used across all Pentax 35MM Film and Digital SLR’s and the K-01 Mirrorless Cameras.

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The Pentax SMC A 50mm f/2  lens has an ‘A’ Position on the aperture ring, allowing the camera to set the aperture, which is necessary for automatic shutter priority, and program modes for newer Pentax bodies.

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All The Best,

Larry Lee Holman