Pentax's classic M42 standard prime — the Super-Takumar 55mm f/2 that defined a generation.
The Pentax SMC Takumar 55mm f/2 is a classic standard prime from Pentax's M42 screw-mount era. As one of the most commonly produced Takumar lenses, it was the default standard lens for Pentax Spotmatic cameras throughout the 1960s and 1970s. The 55mm focal length is slightly longer than the typical 50mm, providing a marginally tighter perspective.
Optical performance is good with a warm, characterful rendering. Sharpness is respectable from f/2 and very good by f/4. The Super Multi-Coating (SMC) version offers significantly better flare resistance than earlier single-coated variants. Some versions use thorium oxide glass that develops a yellow tint over time — correctable with UV exposure. Bokeh is pleasant.
M42 screw mount — adapts to virtually any modern camera system. Filter thread is 49mm. Weight is approximately 205 grams — compact. Build quality is excellent with precision metal construction and a smooth helicoid. The auto/manual aperture switch on the lens barrel controls stop-down behaviour. Several optical versions exist across the long production run.
Extremely common and affordable on the used market — one of the cheapest quality vintage primes available. Check for radioactive thorium yellowing, haze, and fungus. The M42 mount universality makes it one of the most adaptable vintage lenses. An excellent introduction to vintage lens photography and adapting to mirrorless cameras.