Pentax Super-Takumar 55mm f/1.8 (M42)

Adapt one vintage lens to a mirrorless body and the internet points you here first. The Super-Takumar 55mm f/1.8 was the standard normal lens Asahi Optical offered with its screw-mount bodies through the 1960s, and it ended up on the front of a huge number of them. Cheap to make, good enough to keep. It is a double-Gauss design, six elements in five groups, the workhorse formula most makers leaned on for a fast normal in that era, and across the long 1962 to 1971 run what changed was the coating, the aperture mechanism, and the cosmetics rather than the optical element count.

Stopped down to f/5.6 or f/8 it is genuinely sharp across the frame, the kind of resolution that holds up scanned at high resolution today. Wide open at f/1.8 the center stays crisp while the corners go soft and the contrast drops a touch. For a portrait that softness is doing the work, isolating the face while the background falls away. The out-of-focus rendering is smooth and rounded rather than busy, no harsh edges on specular highlights until you are well into a complicated background. Color leans warm, a pleasant cast on skin tones, easy enough to dial out in scanning if you want neutral.

Who shoots it now is anyone who wants a fast normal for not much money. It is the default recommendation for adapting vintage glass to a mirrorless body, and on film it is the natural normal for a Spotmatic or any of the Honeywell-badged Pentax bodies, all in stop-down metering. Note that on the open-aperture ES it works only in stop-down mode, since the plain Super-Takumar lacks the aperture coupling the later SMC lenses use. Street shooters like the 55mm length because it sits between a true normal and a short portrait, slightly tighter than the eye, flattering for faces without the compression of an 85.

The honest weakness is flare. Shoot it into the sun or a bright window without the hood and the coating throws veiling haze and the odd ghost across the frame. The later Super-Multi-Coated versions improved flare control; the plain Super-Takumar holds up less well against direct light, so reach for the metal hood when the sun is in play.

People cross-shop it against the Helios 44-2 and the Canon FD 50mm f/1.8. Against both it has the edge on build, the aperture ring clicking through firm oiled detents and a long, smooth focus throw, and it gives up nothing on image quality. The cheap entry price is half the reason it stays popular four decades on.

One metering note. Wide open at f/1.8 you have a lens that opens up dim interiors, so meter for the shadows you actually care about and let Zone Light Meter place them on the zone you want rather than trusting an averaged reading that the bright window will drag down. The 49mm filter thread is standard and shared across most of the Takumar normals, so screw-on filters move freely between bodies in the kit.