I do pretty much the same as Dave does: meter normally; take the exposure time for f16 and add 6 stops (which works for my pinhole dia. and focal length). Easy and quick to do in my head...no fiddling with my phone. Once reciprocity comes into it then of course I need to refer to a chart, but no big deal.
Sorry, can't give you any feedback about the app.
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Regards,
Svend
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