CLeW

The SMC Pentax 120mm f/2.8 is a rare and refined manual-focus telephoto prime introduced in 1975 as part of the original K-series lineup. Produced for only a few years until 1977, it was designed to offer a slightly shorter alternative to the more common 135mm focal length, making it ideal for portraiture, travel, and compressed landscape scenes. Though overshadowed by its M-series successor, the K-version is prized for its optical clarity, mechanical precision, and distinctive rendering. Optically, it features a 5-element, 4-group design with Super Multi-Coating (SMC) and a 6-blade automatic diaphragm, stopping down to f/32. The lens focuses as close as 1.2 meters, delivers a 0.13× magnification ratio, and uses a 52mm filter thread. It weighs 355g, measures 63 × 75mm, and includes a manual aperture ring with no “A” setting—so metering on modern digital bodies requires stop-down operation. A dedicated PH-R52 hood and hard case were originally supplied. In use, the lens is celebrated for its sharpness from f/4 onward, smooth bokeh, and natural color rendering, with many users noting a subtle “3D pop” in well-lit scenes. Wide open at f/2.8, it shows a gentle glow and slightly reduced contrast—ideal for soft portraits—but sharpens dramatically when stopped down. Chromatic aberration is minimal, and distortion is virtually nonexistent. The focus ring is long and silky-smooth, allowing precise manual control, and the build quality is classic K-series: solid metal, engraved markings, and a reassuring heft.

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Release Date: 1975
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