On the Settings menu, there are four groups of settings you can change:
The rounding rules let you tell f/Calc how you want calculated numbers to be rounded. Without rounding, f/Calc displays calculated numbers with all the precision the computer allows, so you get results like "1.55924536720352". That's fine if you're a mathematician (or a computer!) but most people prefer results a little less precise: "1.56" is plenty of precision for most purposes.
The rounding rules cover two different types of calculated values. F stop numbers (apertures) can be rounded to the nearest half or third of a stop. All other values can be rounded to 1-3 decimal places. You can also elect to turn off all rounding.
When the program comes up, it fills its fields with default values. For example, the default aperture value is f/1.8. These defaults make perfect sense to me, but it occurs to me that you may find these values to be less than satisfactory. :) This dialog lets you enter defaults that make sense to you.
This dialog lets you change how f/Calc behaves on startup. The first thing you can change is which calculation page comes up on startup. You can either tell it to come up to a particular page on startup, or to come up to the last page you used.
The second thing you can change is to tell f/Calc whether or not to save the field values on shutdown and restore them when you start the program back up. If you set this, values in the calculation pages' fields override the defaults you may have set.
Unlike the other three versions, the Palm OS version of f/Calc does not let you put in the circle of confusion value in the Hyperfocal Distance and Depth of Field calculations. Instead, it calculates one based on the diagonal size of the film you have chosen. (See the first link above for details about that calculation.)
For most purposes, this calculated CoC is fine, but some people have special needs, or just want to fiddle with all the possible inputs to a calculation, so this feature lets you fiddle. :)
The override only works while you have a particular film size selected. If you change the film size or exit and restart the program, the calculated CoC returns. For what it's worth, this feature will go away in version 2.0, since you will be able to edit the CoC for each film size.
