Hurwitz's automorphisms theorem: Difference between revisions

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In a [[photograph]], the area of '''critical focus''' is the portion of the picture that is optically [[focus (optics)|in focus]]. This does not relate to [[depth of field]] which describes apparent sharpness.  
Reducing the size of the [[aperture]] will increase the depth of field but the plane of critical focus will not change. Depth of field extends away from the plane of critical sharpness.
 
The image is only critically in focus within a plane.  
The formula that describes the relationship between plane of sharpness, [[photographic lens|lens]] and [[Photographic film|film]] is
:<math>1/I+1/O = 1/F</math>,
where <math>I</math> is the film to lens distance, <math>O</math> is the distance from the lens to the plane of critical focus, and <math>F</math> is the [[focal length]] of the lens.
 
'Critical Focus' is also the title of a regular column by [[Brian J. Ford]] in the American magazine [http://www.brianjford.com/w-CF-01.htm ''The Microscope''].
 
==See also==
*[[Sharpness (visual)]]
 
{{DEFAULTSORT:Critical Focus}}
[[Category:Science of photography]]
 
 
{{Photo-stub}}

Latest revision as of 20:46, 29 June 2014

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