Helen B
TPF Noob!
- Joined
- Sep 16, 2007
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- 3,296
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- Hell's Kitchen, New York
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" Again, focal length, subject distance and aperture control depth of field. Nothing else."
Fred,
Please explain the formula you are referring to that only uses focal length, subject distance and aperture for depth of field.
Here is the simplified one that I believe is correct enough for all but close-up subjects, ignoring pupil magnification:
T = 2 u^2 N C / f^2
Where T = depth of field,
u = distance from first nodal plane to subject
N = f-number
C = maximum acceptable diameter for the circle of confusion
f = focal length
Are you suggesting that the maximum acceptable diameter of the c-o-c has no effect on depth of field?
I have never seen a formula for depth of field that ignores the c-o-c.
Best,
Helen
Fred,
Please explain the formula you are referring to that only uses focal length, subject distance and aperture for depth of field.
Here is the simplified one that I believe is correct enough for all but close-up subjects, ignoring pupil magnification:
T = 2 u^2 N C / f^2
Where T = depth of field,
u = distance from first nodal plane to subject
N = f-number
C = maximum acceptable diameter for the circle of confusion
f = focal length
Are you suggesting that the maximum acceptable diameter of the c-o-c has no effect on depth of field?
I have never seen a formula for depth of field that ignores the c-o-c.
Best,
Helen