Pentax SMC Pentax-M 75-150mm f/4 - Pentax K Mount

The SMC Pentax-M 75-150mm f/4 is a compact, constant-aperture telephoto zoom lens designed for the M-series 35mm film cameras. It features a one-touch 'push-pull' design for controlling both focus and focal length, making it efficient for candid photography. The f/4 maximum aperture provides a consistent exposure throughout the range, and the lens is noted for its relatively small size compared to contemporary zooms of similar reach. When inspecting a used example, check the smoothness of the zoom and focus action; the push-pull mechanism can sometimes become loose or 'creep' if the internal friction collars are worn. SDS verifies the internal optics for fungal growth or excessive dust, which can accumulate in these telescoping designs. The built-in retractable hood should slide freely and stay in place when extended.