- Jul 21, 2010
The ‘fuzzy concept’ is the actual, accepted and published definition of DoF.So from your point of view, when I looked at the picture the DoF was determined.
I believe the outcome was set at capture, because I only intended the picture for one use and size.
If I start cropping, printing large or someone else determining what is acceptably sharp then the fuzzy concept comes in to play.
Yes, you can contrive a specific situation in which you select lens and subject parameters then generate output of a specific size and restrict the viewing of it to a fixed distance and a single person, and in that specific, contrived situation the DoF could be determined at the time of image capture.
And unless the conditions you chose matched those used as the industry standard (you print at 8x10”, view at 12”, and have 20/60 vision), the values for DoF obtained from a DoF calculator/table will not be correct for your specific, contrived situation.
But by the same token in another specific, contrived situation a broken analog clock shows the correct time twice per day.
A proper definition must be generally applicable.