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Differential Focus


dan45 e2
6 42 United Kingdom
23 Sep 2008 5:05PM
I understand this to be keeping part of an image sharply in focus, and another part of it, be it an object in front or behind the main subject, out of focus. Now this to me, is just a shallow depth of field. Am i correct in saying this, or am i mistaken, or misled?
Thanks Smile

(it's for a university assignment, and all the books i've looked at don't really distguish a difference between the D.O.F. and differential focus)

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elowes e2
10 2.8k United Kingdom
23 Sep 2008 5:14PM
It is more about having a focus point in the image but the out of focus area still has a reference to the in focus subject. Duhhhh

By that I mean say a glass of wine in focus but with the wine bottle out of focus.
"An effect achieved by using controlled depth of field to isolate the subject from other objects nearer or more distant in the frame. It is often applied in portraiture and sports photography to simplify composition and blur a cluttered background, usually by selecting a telephoto lens and/or a wide aperture. In cinematography it is possible to “throw” focus within a shot in order to direct the viewer's attention to a significant person or object, e.g. a telephone about to ring." (http://www.answers.com/topic/selective-or-differential-focus)

Hoping this is useful. JNC
dan45 e2
6 42 United Kingdom
23 Sep 2008 5:34PM

Quote:"An effect achieved by using controlled depth of field to isolate the subject from other objects nearer or more distant in the frame. It is often applied in portraiture and sports photography to simplify composition and blur a cluttered background, usually by selecting a telephoto lens and/or a wide aperture. In cinematography it is possible to “throw” focus within a shot in order to direct the viewer's attention to a significant person or object, e.g. a telephone about to ring." (http://www.answers.com/topic/selective-or-differential-focus)

Hoping this is useful. JNC



Much appreciated Smile
elowes e2
10 2.8k United Kingdom
23 Sep 2008 6:42PM
Don't see where differential comes into this definition.

See these examples

http://www.fotosearch.com/photos-images/differential-focus.html

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