pentaprism


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pentaprism

(ˈpɛntəˌprɪzəm)
n
(General Physics) a five-sided prism that deviates light from any direction through an angle of 90°, typically used in single-lens reflex cameras between lens and viewfinder to present the image the right way round
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It also provides other outstanding features rivaling those of high-end models, including: the PENTAX-developed AA (anti-aliasing) filter simulator first installed on the PENTAX K-3 (launched in November 2013); an optical viewfinder with a glass pentaprism to provide approximately 100% field of view; an in-body shake reduction mechanism; and a top sensitivity of ISO 51200.
The camera boasts a glass pentaprism high-performance optical viewfinder with approximately 100% frame coverage (FX format).
The viewfinder is the same 100 per cent pentaprism that's found in the D4 and D800, but it does have a different eyepiece.
To measure the squareness of axes, a pentaprism is used to bend the autocollimator light beam accurately 90 deg.
5 fps, and an optical viewfinder utilizing a glass pentaprism.
The classically styled camera recalls design cues such as a recognizable pentaprism and top cover, which is now constructed of durable, lightweight magnesium alloy.
A high-performance optical viewfinder utilizes a glass pentaprism and offers approximately 100% frame coverage
The EOS 7D camera's viewfinder includes a large all-glass pentaprism with an antireflective coating to maximize clarity and provide a brighter display.
Translucent Mirror Technology, which eliminates the need for a full-frame moving mirror mechanism and heavy glass pentaprism, also contributes to the extremely light design.