The computation of DOF (depth of field) works for 35mm film and for other formats. You need the following data input. Press return, any time you change an input field.
Focal length equivalent to 35mm film.
True focal length.
Factor.
The factor to compute the 35mm equivalent focal length.
If unknown for your camera, this can be computed by looking at the EXIF data and
dividing the 35mm focal length by the true focal length, or use 1 for 35mm, 1.5
for digital SLR, 5 for digital compact.
Acceptable radius of blurriness for 35mm film.
Leica takes 0.025mm, but 0.03mm suffice. The acceptable radius of your camera is
computed from this using the factor above.
Object distance as set on the camera.
Aperture number as set on the camera.
You get the following output, whenever you press return in each input field.
Start and end of DOF.
Hyperfocal distance.
You can use this distance to get the largest DOF to
infinity.
Start of DOF at hyperfocal distance.
Radius of blurriness in infinity converted for 35mm.
Compare this to the acceptable radius of blurriness for 35mm above.