Photography

More on my Depth of Field-program

How to get a depth of field-table:

1. Enter the focal length of your lens in millimeters.
   NB It should be the real focal length, not the 35mm equivalent.
2. Enter the distance in meters.
3. Enter the circle of confusion in millimeters.
   More info on circle of confusion at: http://www.dofmaster.com/faq.html
4. Select Depth of field from the menu.
5. A table similar to the one in the left-hand picture below will be displayed. You can see that for the distance 2.5 m and focal length 50 mm the depth of field will range from 2.11 to 3.05 m at an aperture of 5.6.

How to get a table of hyperfocal distances:

1. Enter the focal length of your lens in millimeters.
   NB It should be the real focal length, not the 35mm equivalent.
2. You don't need to enter the distance.
3. Enter the circle of confusion in millimeters.
   More info on circle of confusion at: http://www.dofmaster.com/faq.html
4. Select Hyperfocal dist. from the menu.
5. A table similar to the one in the right-hand picture above will be displayed. You can see that for the focal length 50 mm the hyperfocal distance will be 13.5 m at an aperture of 5,6.
   This means that you will get a depth of field from 6.75 m (half of 13.5) to infinity.

Limitations

The calculations are based on the lens formula 1/f = 1/a + 1/b which is valid only for thin lenses.
Due to the advanced design of modern lenses you might not get exactly the depth of field calculated by this program. For critical situations you should always make extra exposures with different apertures.

Further questions?

E-mail: magnus@magnus-karlsson.nu