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There is a handy program that calculates depth of field for those of you that have Palm, Visor, or other handheld computers using the Palm operating system.  The program is called Focus+.

There are three parts to the program.  One is the Hyperfocal program. You enter the lens of your choice and it gives you the hyperfocal distance for each aperture on the lens.  You can even choose the circle of confusion you prefer.

The Depth of Field program allows you to enter the lens and focusing distance and the program will give you the near and far limits of the depth of field.

The third program is Calculator. You select the lens and the near and far points you want in focus. The program will calculate the appropriate focusing distance and the necessary lens aperture.

You can download Focus+.  After a trial period, you will need to pay a one time registration fee of $14.95 USD (price is as of the day this page was written) to continue to use the program.

TIP:  Read my article on Controlling Depth of Field and choosing a circle of confusion. For the 35 mm format when using Focus+, choose a COC of 25 to come close to my hyperfocal distance chart which will allows an enlargement of up to 11x16 inches from 35 mm film.

Controlling Depth of Field
More on Depth of Field
Hyperfocal Distance Chart

Nov 13, 2001

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