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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Sanjiv Vohra (Photo credit: Photography by Daryl Ong / Pentaprism Group / www.pentaprism.com)
The weather-sealed body is quite large to accommodate a pentaprism eyepiece with eye sensor, a full-fledged hand grip, a tiltable display and weather-sealed flaps for ports.
Methods Measurement accuracy/mm Mechanics Template method [+ or -]0.1~0.2 Lathe method [+ or -]0.02~0.1 Optics Theodolite and <[+ or -]0.2 steel tape method Double pentaprism [+ or -]0.15~0.66 method Methods Scope of application Mechanics It is only suitable to measure the antenna in elevation and more effective for the installation and detection of small and medium antennas.
The team then designed a second scanning pentaprism test, to guard against errors in the first test.
The viewfinder is the same 100 per cent pentaprism that's found in the D4 and D800, but it does have a different eyepiece.
Then look no further than the new Panasonic Lumix G1, the world's first SLR to use the revolutionary Micro Four Thirds format.The Lumix G1 has done away with the traditional pentaprism for TTL (through the lens) viewing and replaced it with an electronic viewfinder, resulting in a much smaller body (and lenses) that can be easily carried in an overcoat pocket.
After the war Pentax (the corporation's name being derived from the words 'Pentaprism' and 'Reflex') made many notable advances in camera design.
It uses a pentaprism single-lens- reflex (SLR) viewfinder and 1.8-inch backlighted color TFT LCD to review images.
To measure the squareness of axes, a pentaprism is used to bend the autocollimator light beam accurately 90 deg.
Sitting next to the Nikon D3s, its higher than it in height but a little narrower in depth, with a noticeably smaller pentaprism bulge, which is obvious given the huge viewfinder that full frame cameras have.