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## Depth of Field ApproximationsThe depth of field equations can be simplified when the focal length of the lens is much less than the focal distance. The approximations are: Hyperfocal distance: Near distance of acceptable sharpness: Far distance of acceptable sharpness:
f-number is calculated by the definition i = 0, 1, 2, 3,... for f/1, f/1.4, f/2, f/2.8,...Calculations using these equations must use consistent units. When focal length and circle of confusion have units of millimeters, the calculated hyperfocal distance will have units of millimeters. To convert to feet, divide ## Derivation of Depth of Field ApproximationsBegin with the hyperfocal distance equation: Define This can be stated as:
With the near distance equation: Rearrange the equation: Substitute As With the far distance equation: Rearrange the equation: Substitute When © 2002 Don Fleming Privacy Policy |