1) Photography equipment
Found on
https://www.crosswordclues.com/clue/pentaprism
A pentaprism is a five-sided reflecting prism used to deviate a beam of light by a constant 90°, even if the entry beam is not at 90° to the prism. The beam reflects inside the prism twice, allowing the transmission of an image through a right angle without inverting it (that is, without changing the image`s handedness) as an ordinary right-ang....
Found on
http://en.wikipedia.org/wiki/Pentaprism
Optical device, found on SLR cameras, which corrects the image (reversed by the lens), allowing eye-level viewing and focusing via the viewfinder. (see Finder, Focusing screen,& SLR )
Found on
https://www.encyclo.co.uk/local/20176
No exact match found.
