In a single lens reflex (SLR) camera, the image enters the lens and strikes a
mirror. This mirror deflects the image onto a ground glass for focusing.
The mirror flips out of the way during exposure; therefore, the viewing lens
is the same lens that records the image.
Figure 4-17 shows how an image passes through an SLR.
Figure 4-17. View through a SLR.
Camera components are similar to those of a process camera. There is a film
or focal plane, a lens, and the object or a copyboard. Shutter speed settings
and apertures or f/stops are adjustable. There is also a setting to indicate the
film speed to the automatic sensors in the camera. Lenses are
interchangeable on 35mm cameras.
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