Depth of Field Calculator
How to use the light choices:
Green: It is the value to use with most images.
For precision work (e.g. where you measure the distance to the subject) use Red or Blue.
Red: To guarantee that a subject INSIDE the DOF will be IN FOCUS throughout the entire visible spectrum.
Blue: To guarantee that a subject OUTSIDE the DOF will be OUT OF FOCUS throughout the entire visible spectrum.
When using Red or Blue you will likely need to measure the distance from the subject to the CCD-plane indicator on the camera body
Simple COC definition values are based on the formula CoC=format diagonal/1500 as noted here. We added this option as a reference because this is the value most on line DOF calculators use.
*Use focal lenght as indicated on your lens
Diffraction: please note that out diffraction calculation is only for curiosity purpose, and just as DOF calculation it is based on fixed size (8x10in as explained in the recommended reading) and distance from the print. This makes resolution (MP) differences between cameras somewhat irrelevant.
You can find an very interesting discussion related to this calculator in our forum.
If you have any suggestion please let me know.