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| − | + | A '''Pentaprism''' is a five-sided optical glass element that reflects light through 90°. A variant, the ''roof pentaprism'', has two sloping sides on one of the reflecting surfaces, usually the top, to allow light from the mirror of an [[SLR]] to be reflected into an eye-level [[Reflex finder|(reflex) viewfinder]] with the picture appearing the correct way around to the photographer. This avoids the problem suffered by other reflex viewfinder systems, which can have the image laterally (left-right) reversed - or even upside-down. This made framing difficult, and following a moving subject confusing. The roof pentaprism is the reason for most SLR cameras having a triangular top to their viewfinders. |
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| + | |image_source= http://www.flickr.com/photos/24225011@N04/2345422972/ |
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| + | |image= http://farm3.static.flickr.com/2054/2345422972_9748f565fc.jpg |
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| + | |image_align= right |
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| + | |image_text= Light from the subject goes through the lens,<br>is reflected from the mirror, then is flipped<br>through the pentaprism, through the eyepiece lens to the eye. |
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| + | }} |
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=== Links === |
=== Links === |
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[[Category: Viewing system]] |
[[Category: Viewing system]] |
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[[Category: Focusing system]] |
[[Category: Focusing system]] |
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| − | [[Category: Camera parts]] |
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