Cosina CT-1

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The Cosina CT-1 is a manual focus 35mm SLR from Cosina. It accepts K mount bayonet lenses.

It has a vertically-traveling metal focal-plane shutter with speeds from 1s to 1/1000 and B. Flash sync is at 1/125 sec. The self-timer is mechanical, with a delay of approx 10 sec. It features an open-aperture TTL match-needle center weighted metering system using a CdS cell. The meter has a range of 3 to 18 EV at (ASA 100), and can be set to film speeds of 25 to 1600 ASA. Note that the meter was designed to take power from a single 1.35 volt mercury button cell, now banned. Common alkaline and silver-oxide cells which fit the battery compartment physically are 1.5 volts and will likely give incorrect meter readings.

The CT-1 was followed by the very similar Cosina CT-1A, which replaced the analog needle exposure display with three LEDs.

Cosina has a long history of manufacturing cameras under contract to be sold under the branding of different companies. Many sources on the web[1] state that this model was the basis for cameras such as the Nikon FM10 and the Olympus OM2000.

It may be more accurate to say that this model's successor the CT1 Super was the basis for many other cameras; the "Super" was a model which includes the 1/2000 sec top shutter speed and the match-LED metering display which became standard in most later Cosina-built SLRs. But the CT-1 does feature the domed shutter button, wind-lever shutter lockout, and distinctive baseplate[2] which carry through all the way to the Vivitar V4000.


  1. An example is the English Wikipedia article on this camera.
  2. An image here shows the family resemblance.