KMZ Zenit

Press the release on an original Zenit and the finder goes black, then stays black. The mirror swings up for the exposure and parks there until you advance the film, because winding on is the only thing that brings it back down. It has no instant return. Every frame ends with a dark eyepiece and a hand reaching for the wind, and after a roll or two the rhythm sinks in: shoot, wind, look again.

KMZ got there by surgery rather than a clean sheet. The donor was its own Zorki rangefinder, which was itself a FED copy of the Leica II. Out came the rangefinder; on went a fixed pentaprism with a mirror box underneath. Plenty of Leica habits survived the operation. Film goes in through the bottom, threaded half blind, and a cloth focal-plane shutter runs across the gate. KMZ made 39,019 of these between 1952 and 1956, the bulk in 1954 and 1955, and the M39 Zenits that followed trace back to this body.

Speeds run 1/25, 1/50, 1/100, 1/250 and 1/500, plus B. That's the whole menu. Below 1/25 you are on B with a watch, so handheld work at dusk gets tight quickly. Flash is simply absent: no contact for bulbs, none for electronic units, nothing to plug into. The Zenit-S was the model that fixed that. In return there is no battery anywhere in the body, and since the mirror stays up after the curtains close, nothing slaps back at the end of the exposure. The mechanical noise moves to the wind stroke instead.

The standard lens was the Industar-22, a 50mm f/3.5 Tessar type, later replaced by the Industar-50. You focus wide open on a plain ground-glass screen that gets hard to read in low light at f/3.5, then turn the aperture down by hand before you shoot. Forget, and the frame goes down at f/3.5. Then comes the mount trap. The thread is M39, same as a Leica, but the flange sits at 45.2mm against Leica's 28.8mm. A Leica-thread lens screws straight on and then focuses only close to the subject, which makes it a close-up lens and nothing more. For anything at normal distances you need Zenit-thread glass.

The real cost is pace. Between focusing open, stopping down and winding just to get your view back, a second shot of the same moment is out of reach. Buildings, still lifes and people willing to hold a pose suit it; anything that moves on its own schedule does not. Worked slowly, it feels closer to a small view camera than to the SLRs that followed it.

Next to a Zenit-E the original asks more of you, since the E brings an instant-return mirror and a selenium meter with far less fuss. People buy the first Zenit for its history and keep it because it still works. There is no meter of any kind, so an incident or spot reading from the Zone Light Meter app is how you place exposure: read the scene, set the speed and aperture, release. Keep the 1/25 floor in mind and carry a tripod once the light drops.