pentaprism

 [pen-tuh-priz-uhm]  

pen·ta·prism

   [pen-tuh-priz-uhm]
noun
a prism that has five faces, a pair of which are at 90° to each other; a ray entering one of the pair emerges from the other at an angle of 90° to its original direction: used especially in single-lens reflex cameras to reverse images laterally and reflect them to the viewfinder.
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Also, penta prism.

Origin:
1935–40; penta- + prism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Pentaprism is always a great word to know.
So is gobo. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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Collins
World English Dictionary
pentaprism (ˈpɛntəˌprɪzəm)
 
—n
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 & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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