A single lens reflex (large print)

By: Rnib

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Synopsis: This is a cross section side view of a single lens reflex camera seen from the side with a labelled enlargement of the mirror, and a key. There is a locator dot shown, which will be at the top left of the page when the image is the correct way up. The camera can be found in the bottom left of the page. A ray of light enters the camera through the lenses at the right of the image. It is represented by a left-pointing arrow. The ray then strikes the mirror to the left, which is angled at 45 degrees. The ray is then reflected through 90 degrees up the page to the pentaprism (five-sided prism), where it is reflected off two of the internal surfaces and exits left through the viewfinder lens at the top left of the image. To the left of the viewfinder is an eye seen from the side and facing to the right. The ray enters the eye and projects an image on the retina (not shown) on the left of the eye. Part of the mirror in the centre of the camera's image is circled with a dashed line with a line going up and right to another dashed-line circle containing an enlarged view of the mirror section. The light ray is shown being reflected off the surface of the mirror. The angles of incidence and reflection are labelled with abbreviations, and there is a key to the abbreviations in the top left of the page.

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