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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Since removable pentaprisms seem to be going the way of manual focus - all the latest cameras from Canon and Nikon have fixed pentaprisms - there should be a way to use cameras like the Canon EOS 1N and Nikon N90s for those dramatic shots where the camera is placed on the ground and the scene is viewed from above, not from eye level.
Nikon's F4 (and F4s), its top-of-the-line autofocus SLR, retains its removable pentaprism. But the company's latest technology appears to be going into the N90s.
New film cameras and equipment

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