Depth of Field…D.O.F. The topic is.....Depth of Field.......DOF
The depth of field (DOF) is the distance in front of and behind the subject which appears to be in focus. This doesn't mean everything in front & behind the subject is in focus, just a short distance. The total of the in focus part being the DOF For any given lens setting, there is only one distance at which a subject is precisely in focus, but focus falls off gradually on either side of that distance, so there is a region in which the blurring is noticable before & after the in focus distance bit:-)
If you can't understand this then have a few beers & read it again.
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