Penta prism: Five sided prism used to give correct viewing of the image and reflect it on to the focusing screen.
Perspective: System of representing three dimensional objects on a two dimensional surface to give realistic impression of depth.
1957 - Asahi Pentax, world's SLR with a penta prism thus allowing eye-level viewing with correct perspective
1960 - world's first automatic diaphragm
1964 - TTL metering, the Spotmatic is the world's first SLR with ttl metering ...
 See also: Coated, Green, Blue, Color filters, Color film
  
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