Lens Mount and How to Change the Lens

Ever sihce the Canonflex was introduced in 1959, Canon's SLR cameras have been adopting the breach lock mount which makes it very easy to attach or detach the lenses. It takes, indeed, one third of the time it would to change a lens on a screw-in type of mount.

The lens is attached by aligning its red dot to the red dot on the camera body, and then turning the bayonet ring to the right and fastening it. Al1 mechanisms necessary for coupling are adjusted automatically.

Full Aperture and Stopped Down Metering

Full aperture metering in the F-1 is done by means of matching needles, and proper exposure is obtained when the meter needle matches the aperture needle after rotating the preset aperture ring or the shutter speed dial. In the same operation stopped down metering can be performed by pushing the stopped down functioning lever down.

Signal Transmission and Function of the FD Lenses

Automatic/Manual Aperture Lever

This is the conventional coupling lever for stopped down metering which automatically resets the full aperture opening position after shutter release. This lever also couples with the stopped-down functioning and self-timer lever on the camera body. Stopped down metering can be performed after turning the stopped-down functioning lever.

Full Aperture Signal Pin

This pin is used to compensate metering errors at large apertures when a large aperture lens is used. To correct this error, the full aperture signal pin plays a role in adjusting the position of the matching needle.

Aperture Signal Lever

This is a coupling lever that plays three important roles in full aperture metering. It is coupled with the preset aperture ring and transmits the preset f/stop position to the exposure meter on the camera body.

As soon as the shutter is released, the aperture closes down to the preset f/stop due to this lever, and proper exposure is obtained. Its second function is to transmit the automatic aperture setting to the exposure meter. When a lens is mounted on | the camera body, the ~ aperture is transmitted to | the exposure meter and the l aperture needle is set. Therefore, aperture adjustment is automatic.

The third function is automatic aperture control for servo EE photography with the F-1. When the preset aperture ring is set at the green circle, this lever is automatically disconnected from the preset aperture ring and can move freely. When the Servo EE Finder is attached, it is coupled to the aperture signal lever. The Servo EE Finder then controls its position, for fully automatic exposure control.

Unmanned EE photography is possible by using the Servo EE Finder and Motor Driver Unit. Only FD lenses can be used for automatic exposure control.

Manual Aperture Control

When the automatic/manual aperture lever is turned all the way, it clamps and stops. When the lens is mounted under these circumstances, the aperture can be operated manually. This function is used when an extension tube or another accessory is connected between the camera body and the lens. However, in normal photography with an F-1, this function is not required.

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