Dear Sir,
I think still you are under some confusion regarding depth of field and circle confusion.The depth of field does depend upon Focal length of the lens used, the aperture and the focussed distance. It does not depend upon how much enlargement is done. If you enlarge the picture then you must see it from the proper distance which depends upon the digonal of the print, the focal length used when the photograph was taken and the viewers distance from the print. There is a very good book named "The Science of Photography" and I request all the members to go through it. I have gone through many articles on the said subject, and unfortunately found that most of the readers are under many confusions. Another confusion is that the depth of field is devided in two parts 1/3rd is in front and 2/3rd is behind the fucused distance. It is not so. For a very few combinations i.e. combination of focal length, aperture and focused distance it is true. But exceptions does not prove the rule. You have to calculate the depth of field using proper formulae. If the members are interested I am ready let you know the formula.
Chandrashekhar Bapat
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