I don't generally use calculators for dof and other things because I know the basic formulas and can do most of the calculations in my head. But since I carry my cell phone with me pretty much all the time, I might as well install apps for my AT&T Samsung Captivate android phone. Things I might consider are dof calculators, exposure meters (for when I am out walking without my gear), or anything else which any of you have found useful for large format. I regularly jot down my settings when shooting ina small notebook, but I suppose I could use the cell phone for that with an appropriate app for taking notes, so recommendations for such note taking might also be useful.
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