This is a Depth of Field Calculator for use with Microsoft Excel. Use it from your computer or your pda to calculate the most appropriate DOF for every shot.

1. Enter the Subject Distance
2. Select the unit of measurement (mm, cm, inch or feet) of Subject Distance
   The Subject Distance is converted in other units and entered in appropriate cells
3. Enter the Circle of Confusion in mm
   Circle of Confusion is converted in other units and entered in appropriate cells
4. Enter the Focal Length in mm
   Focal Length is converted in other units and entered in appropriate cells
5. Enter the Aperture, for an aperture of f/8 enter 8
   Aperture is just a number so it is copied across other units as the same number
6. The grid keeps updating the result as you enter the numbers
7. A Negative calculated result means infinity
8. A ### means the calculated value is too large