Pentax SMC Takumar 50mm f/1.4 (M42)

A dim apartment, one window, late afternoon light dying fast. You want a frame that holds the face and lets the rest of the room melt off. Wide open at f/1.4 the Takumar gathers light most kit zooms can only dream about, and the focus falloff is gradual rather than surgical, so a portrait gains depth instead of a hard cutout. Close down to f/2.8 and it sharpens up considerably, the soft glow tightening into real bite across the center. That swing from dreamy to crisp over two stops is most of why people keep the lens around.

Super-Multi-Coating is what the SMC stands for, and it mattered. The coating arrived on Pentax glass around 1971, carrying into the SMC Takumar run through the mid-seventies, and it was genuinely ahead of the pack at suppressing flare and lifting contrast in backlit scenes. Shoot into a window or a streetlight and you get a controlled veiling glow rather than a washout of ghosts. The double-Gauss design behind it is the standard fast-fifty layout of the era, and Pentax executed it cleanly. Color leans warm. There is a faint yellow cast in some samples, partly the coating, partly the radioactive thoriated glass in the rear element, which ambers over decades. Many shooters leave that warmth alone on portrait stocks because skin likes it.

Bokeh is the contested part. Wide open the out-of-focus rendering is soft and rounded, pleasant on close subjects, though backgrounds with fine specular highlights can get busy and the edges of the frame show some swirl and cat-eye stretching. It is not the creamiest fifty ever made. It is character glass, and people who want clinical neutrality should look at a modern planar instead. The other honest weakness is that yellowing on the thorium versions. If your copy has gone visibly amber, white balance correction or a deliberate cool film choice is the fix, though days of UV exposure can also bleach a lot of it back out.

Who reaches for it. Anyone learning fast-prime portraiture on a budget, plus a lot of digital shooters who adapt M42 onto mirrorless bodies precisely for that vintage glow. The aperture ring clicks in real stops, the focus throw is long and smooth, and the metal build shames anything plastic. It cross-shops against the Helios 44 (cheaper, more swirl) and the Canon FD 50mm f/1.4 (cleaner, less warmth), and on coating quality for the money it usually comes out ahead.

One metering note. Wide open in that fading window light, an in-camera average reading will chase the bright glass and crush the face. Spot the cheek with Zone Light Meter and place it where you want it, then let the f/1.4 hold the rest. The 49mm filter thread takes a standard polarizer or ND if you want to drag the shutter on a tripod in daylight, since the lens has no shutter of its own and rides whatever the body gives it. For a lens that left production in the mid-seventies, it still gives back more than its asking price suggests.