Zenit's aperture-priority Soviet M42 SLR — the 18, TTL metering, auto exposure, 1980.
The Zenit 18 is a 35mm film SLR made in the Soviet Union by KMZ from around 1980, a more advanced and less common model in the Zenit line that introduced aperture-priority automatic exposure. It was produced in far smaller numbers than the mass-market Zenit-E family, making it a comparatively scarce and more sophisticated body among Soviet SLRs.
It is an M42 screw-mount SLR with a focal-plane shutter and a battery-powered through-the-lens meter. Unusually for a Zenit, the 18 offers aperture-priority automatic exposure alongside manual control, with the electronics setting the shutter for the chosen aperture. Because it relies on electronic timing for the automatic mode, it depends on its battery to expose correctly in auto, and the meter needs a cell to function.
The Zenit 18 suits collectors and users interested in a more capable Soviet SLR with automatic exposure, unlike the plain mechanical Zenits that dominate the range. It handles as a heavier, more feature-rich body, with aperture-priority auto its distinguishing feature; its relative scarcity and greater complexity make parts and servicing harder than for the ubiquitous Zenit-E.
On the used market, Soviet build quality varied between samples and this less common model can be harder to find in working order, so test it thoroughly. Because it uses electronic auto exposure, check it fires and meters correctly with a fresh battery across auto and manual, since a flat cell affects the automatic mode. Inspect light seals and dampers for perishing, run the shutter for capping and off timing, check the prism and screen, and test advance and rewind; expect sample-to-sample variance.