Optical prisms added to the design are another way to turn the image right way up, usually in a Porro prism or roof-prisms design.
12.
This effect reduces contrast and resolution in the image perpendicular to the roof edge, producing an inferior image compared to that from a porro prism erecting system.
13.
Another prism design was the porro prism system used in the Olympus Pen F, the Pen FT, the Pen FV half-frame 35 mm SLR cameras.
14.
Unlike the more common double Porro prism configuration, the Abbe Koenig prism does not displace the output beam from the input beam, making it advantageous in some instruments.
15.
See the article on porro prism and the article on binoculars for more . 192.168.1 . 1 6 : 50, 24 Rocktober 2006 ( PST)
16.
This reflectivity is much improved compared to either an aluminum or silver mirror coating and the performance of the Schmidt Pechan prism is similar to the Porro prism or the Abbe Koenig prism.
17.
Porro prism binoculars and roof prism binoculars using the Abbe Koenig roof prism typically do not use mirror coatings because these prisms reflect with 100 % reflectivity using total internal reflection in the prism.
18.
Most SLRs use a roof pentaprism or pentamirror to observe the image via an eyepiece, but there are also other finder arrangements, such as the waist-level finder or porro prisms.
19.
A porro prism is not a roof prism, contrary to popular notion, as the two 90?faces usually don't meet in a Porro prism and therefore don't form a roof edge.
20.
A porro prism is not a roof prism, contrary to popular notion, as the two 90?faces usually don't meet in a Porro prism and therefore don't form a roof edge.
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