The SMC Pentax-M 150mm f/3.5 is a compact manual-focus telephoto prime introduced in 1977 and produced until 1986, designed for full-frame K-mount film cameras. It was part of the second-generation “M” series lenses, offering a slightly faster aperture and more compact build than its K-series predecessor, while maintaining Pentax’s hallmark of optical clarity and mechanical precision. Optically, it features a 5-element - 5-group design with Super Multi-Coating (SMC) and a 6-blade automatic diaphragm. The lens stops down to f/32, focuses as close as 1.8 meters, and delivers a 0.1× magnification ratio. It uses a 49mm filter thread, weighs just 290g, and measures 63 × 75mm. It includes a built-in sliding hood, a manual aperture ring (no “A” setting), and was typically sold with a dedicated hard case. There’s no internal focusing or weather sealing, but the lens is fully compatible with all Pentax K-mount bodies, including digital cameras with manual exposure support.

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Release Date: 1977
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