Instant Return Mirror - See "Single Lens Reflex camera."
Internal Focusing - Types of lens that have internal components that can be adjusted in order to focus a shot, rather than depending on adjusting the lens barrel.
Instant Return Mirror
Another name for the reflex mirror found in SLR's. It returns to its normal position as soon as a picture has been taken so that you can see through the viewfinder.
Integral Flash ...
1954 - Asahiflex II, world's first SLR with an instant return mirror
1957 - Asahi Pentax, world's SLR with a penta prism thus allowing eye-level viewing with correct perspective
1960 - world's first automatic diaphragm ...
 See also: Space, Pixel, Sensor, Meter, Resolution
  
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