-Angular field - the angle subtended at the lens by the diameter of the largest circle within which the lens gives an image of acceptable sharpness and even illumination.
Also called angular fields. ANHYDROUS-Dry, containing no water of crystallization.
The angular field of view assumes infinity focus, and the linear field of view is also based on that, which isn't technically correct, but as described below the corrections for closer focusing aren't significant until you get into the macro range.
 See also: Photograph, Film, Focus, Format, Focal
  
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