|To find the near, far, and hyperfocal distances select the desired Film Format, Focal Length, and Aperture and enter a value for Object Distance. Clicking the "Generate" button will calculate the near, far, and hyperfocal distances. In addition, a table showing the near and far distances for a variety of aperture and object distance combinations for the focal length you chose will be generated as a handy reference.|
The formula used were extracted from the references supplied and are as follows:
Hyperfocal Distance = Focal Length of Lens 2 / (Aperture * Circle of Confusion Diameter) Circle of Confusion Diameter (Zeiss formula) = Diagonal Measure of Film / 1730 Near Distance = (Hyperfocal*Object Distance) / (Hyperfocal + (Object Distance-Focal Length)) Far Distance = (Hyperfocal*Object Distance) / (Hyperfocal - (Object Distance-Focal Length))
"Mastering Large-Format Depth-of-Field", by Gerry Russell, Mastering Black-and-White Photography, Vol. II (Annual Special #7), Darkroom and Creative Camera Techniques'
"Depth-of-Field of Camera Lenses", Photo-lab Index, 1971
Note: This originally came from http://www.par.univie.ac.at/~bob/photo/DOF.html. However, I found an apparent error in the formula used to calculate the Circle of Confusion - I updated this to use the Zeiss formula. In addition, changes were made to write the Depth of Field table to a new window formatted in a nice table for printing.