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The Canon FTb is a 35 mm single-lens reflex camera manufactured by Canon of Japan from March 1971 replacing the Canon FT QL. It features a Canon FD lens mount, and is also compatible with Canon's earlier FL-mount lenses in stop-down metering mode. Launched alongside the top-of-the-line F-1, the FTb was the mass-market camera in the range.

The FTb was primarily intended to be a camera for the advanced amateur photographer, offering many of the same features and same build quality as the F-1, but without the option of interchangeable prisms, focusing screens, or motor drives. The Canon FTb was released at a retail price of 35,000 yen for the camera body ($99, or $580 USD in 2014 USD).

The FTb has an all-mechanical horizontally traveling focal plane shutter with timed speeds from 1/1000 to 1 second and bulb. The FTb has rubberized silk shutter curtains rather than the more durable but more expensive titanium curtains found on the F-1.

It offers a 10-second self-timer, as well as mirror lock-up.

The meter is of the 12% (1/9) partial type with the metering area indicated by a slightly darkened box in the center of the finder area. It is fully coupled to shutter speed dial and aperture ring on FD lenses in the match needle style. The meter was designed to be powered by a single 1.35 volt 625-type mercury cell, specifically the Mallory PX-625 and the Eveready EPX-625. While these batteries are obsolete, modern replacements include the Wein zinc-air cell PX625, available at large online retailers. Alternative options for replacement are to use a 1.5 volt silver battery either through a voltage dropping adapter or recalibrating the meter. Using modern zinc air batteries provide the original voltage, but have a relatively short life.

In 1973, the FTb design was revised slightly. The camera was given a plastic tipped film advance lever. The stop down lever was changed to the same style as that found on the F-1. The PC sync socket was given a spring-loaded plastic cover. The ring around the outer edge of the shutter speed dial was changed from a scalloped design to a diamond textured design. Finally, a shutter speed display was added in the lower left hand corner of the viewfinder. This model was unofficially known as FTb-N or FTbn.

Name: Canon FTb QL
Manufacturer: Canon Japan
Made in: Japan
N°: 507289
Production Date: Mar 1971
Type: 35mm focal-plane shutter SLR camera
Series: F Series
Picture Size: 24 x 36 mm
Normal Lens: Canon 55mm f/1.2, FD 50mm f/1.4, 50mm f/1.8
Collection Lens: Canon FD 50mm f/1.8 S.C
Lens Mount: FD mount
Focus: Manual Focus
Shutter: Two-axis, horizontal-travel focal-plane shutter with cloth curtains. X, B, 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000 sec. Built-in self-timer (self-timer lever also functions as a stop-down lever). Multiple exposures enabled.
Dimensions & Weight: 144 x 93 x 43 mm, 750 g
Production Period: March 1971 - 1973
N° Produced: 1.800.000
Original Price: 49,800 yen (w/FD 50mm f/1.8)
Indexed Price (Approx.): 1.275 EUR
Avg Ebay Value: 60-150 EUR

Source: Canon Camera Museum, Wikipedia.org, Camera-wiki.org, knippsen.blogspot.com