| 摘要 |
In a single lens reflex camera, a mirror can be positioned at an angle between the rear of the taking lens and the film to reflect the light rays that come through the lens, on to a focusing screen of the viewfinder, and it can be positioned out of the way to expose the film. The mirror is supported to swing in an arc about a single axis, without inverting the mirror, from its light-reflecting position to a non-reflecting position at least partially beneath the taking lens. This kind of movement of the mirror advantageously permits the back focus of the lens required to clear the mirror for its movement to be reduced.
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