R bayonet
The Canon R bayonet is a lens port for Canon mm film - SLR , the later FL bayonet and finally to the FD bayonet was further developed. The R-bayonet itself has no transmission elements , Canomatic and Super-Canomatic supplement a semi-automatic or fully automatic open aperture function.
R bayonet
Period
The Canon R-bayonet appeared in May 1959, practically at the same time as the F-bayonet of the competitor Nikon . It was replaced by the FL bayonet released in 1964. Some telephoto lenses remained in the range until the end of the 1960s.
construction
The R-bayonet has no transmission elements, it is only a fastening of the lens to the camera. In contrast to the constructions of other manufacturers, it is an outer bayonet, which means that when attaching a sleeve is rotated that the lens on the Camera stuck. Canon advertised this with the advantage that the surfaces responsible for the precise spacing do not rub against each other and thus do not wear out, but in 1987 they switched to the common internal bayonet with the EF bayonet . The union ring must be turned about a quarter of a turn clockwise to secure it.
The flange focal length of 42 mm is quite small for a 35mm SLR system. At 48 mm, the inner diameter is larger than the widely used M 42 lens thread .
Cameras
Canon offered the following cameras for the R connection:
- 1959: Canonflex
- 1960: Canonflex RP
- 1960: Canonflex R 2000
- 1962: Canonflex RM
With the exception of the RM, these cameras do not yet have a built-in exposure meter, and the RM’s exposure meter is only linked to the shutter speed dial; the aperture has to be transferred manually to the lens.
compatibility
The lenses of the R bayonet can also be used on the later cameras for FL and FD lenses. The exposure measurement must then be carried out with the working aperture.
Canomatic
Canomatic
R lenses with the simple Canomatic have a pin as a transmission element, which is pressed by a lever on the camera side during the exposure. Then the lens fades down to the selected aperture value. The mechanism must be manually tensioned on the lens before stopping down.
Super Canomatic
R lenses with Super Canomatic have two transmission elements; the simple Canomatic pin has a lever through which the camera can open the mechanism (while the film is being transported) to obtain a fully automatic diaphragm . You can also move the lever by hand to attach a lens to an already cocked camera.
compatibility
The Canomatic works exclusively with the Canonflex cameras. The following Canon FL bayonet uses a different system for the spring diaphragm. But you can use Canomatic lenses on cameras for the FL bayonet. This also applies to the Super Canomatic, as the spring shutter lever moves in the opposite direction to the elevator lever. Since all Canomatic lenses have two aperture rings, one can preselect the aperture on cameras with the FL bayonet with one ring and switch between open and working aperture with the other ring.
R lenses
program
particularities
When the first Canonflex appeared in May 1959, the range was limited to two lenses with a focal length of 50 mm and 135 mm. The telephoto range was gradually expanded, but only the 35mm appeared on wide-angle lenses in August 1960. Although the competitor Nikon had several wide-angles in its range, Canon only introduced larger image angles with the FL bayonet.
Special lenses
Canon introduced its first zoom lens for the R bayonet , the R 55-135 mm f / 3.5.
List of lenses
- R 35 mm f / 2.5
- R 50 mm f / 1.8 (three versions)
- R 58 mm f / 1.2
- R 85 mm f / 1.8
- R 85 mm f / 1.9
- R 100 mm f / 2 (two versions)
- R 135 mm f / 2.5
- R 135 mm f / 3.5 (two versions)
- R 200 mm f / 3.5
- R 300 mm f / 4
- R 400 mm f / 4.5
- R 600mm f / 5.6
- R 800 mm f / 8
- R 1000 mm f / 11
- R 55-135 mm f / 3.5
swell
- Günter Richter: The Canon reflex system . Laterna magica 1980. ISBN 3-87467-118-6
- Canon history (PDF) (1.69 MB)