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IV TECHNICAL EXPLANATION OF THE CAMERA
The Canon EF is a 35mm single-lens-reflex AE (automatic exposure) camera which is designed for fast handling and precise exposure control. Being modularly constructed, it contains many advanced electronic circuits to make picture-taking easier than ever before.
A Electro-Mechanical Shutter
The vertically moving metal focal plane shutter in the EF has speeds from 1/1000 sec. down to a full 30 seconds, plus a "B" (Bulb) setting for manual time exposures. The shutter is electronically controlled in its slow range from 1–30 sec. in six discrete steps (1, 2, 4, 8, 15, and 30). The red Light Emitting Diode (LED), just to the left of the pentaprism, blinks on and off to indicate when the shutter is open. In the normal range in which most photography will be performed, the shutter is mechanically controlled from 1/2-1/1000 sec., plus B, in ten steps (1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/500, 1/1000, and B). Electronic control of the shutter in the slow range insures high accuracy for long shutter speeds, whereas mechanical control in
the normal range permits manual operation of the
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