Yashica's late-1960s M42 SLR — the TL, mechanical shutter, stop-down TTL metering, screw mount.
The Yashica TL is a 35mm film SLR from the late 1960s, built when Yashica was expanding its line of affordable single-lens reflex cameras aimed at enthusiasts and students. It used the M42 screw thread, the same universal mount found on Pentax, Praktica and many other bodies of the period, which gave owners access to a very wide range of third-party and manufacturer lenses. It sat in the entry-to-mid part of Yashica's range before the company moved to the Contax/Yashica bayonet in the mid 1970s.
As an M42 screw-mount SLR for 35mm film, the TL takes the standard 42mm screw thread lenses of the era. It is a mechanical camera with a cloth focal-plane shutter and through-the-lens metering using a stop-down (match-needle) method typical of screw-mount bodies of this generation, where the meter reads at working aperture. Exposure is set manually by the photographer. Because the shutter is mechanically timed, the body fires without a battery; the battery powers only the light meter.
The TL suits someone learning manual exposure or building an inexpensive M42 system, since the screw mount opens up a large pool of cheap vintage glass. Handling is straightforward with a bright viewfinder and simple controls, and the all-mechanical shutter is forgiving of long storage. Its limits are the stop-down metering workflow and the lack of any automatic exposure, which some users find slow compared with later aperture-priority bodies.
On the used market the TL is an inexpensive M42 body, and condition is what matters. Check the foam light seals and mirror-damper foam, which have usually perished on a camera this old and cause light leaks until replaced. Confirm the shutter fires at all marked speeds without capping, and test the meter: cameras of this era were often designed around 1.35V mercury PX625/625 cells, so readings may be off with modern alkaline replacements. Inspect the prism for desilvering or foam haze, and work the film advance and rewind to check they feel smooth.