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BASIC OPERATION
H Viewing and Focusing
The Canon EF is a single-lens-reflex (SLR) camera. This means that you view the subject through the same lens as is used to take the photograph. Continuous viewing (except at the moment of exposure) is made possible by the use of an instant-return mirror located inside the body just below the pentaprism. Since the picture you see in the viewfinder is the same as the one recorded on the film, parallax is completely eliminated. The view- finder remains bright during AE operation, because through-the-lens metering (TTL) is performed with the lens at maximum aperture. Focusing is made easier by a split-image/microprism rangefinder. You rotate the focusing ring while looking through the viewfinder until the point where the divided image of the subject on the split-image focusing screen can be seen correctly matched in the center of the viewfinder. The subject snaps into sharp alignment at proper focus. For a subject not having straight-line forms or with indistinct outlines, you have the choice of using the microprism ring around the split-image focusing screen. The microprism shatters out-of-focus images very well and snaps into sharpness at the precise point of focus. When using certain lenses (such as macro or super-telephoto), the
ground glass with the fine-lined Fresnel screen outside the microprism area will aid you in focusing.
