I have a nice, $400 Minolta IV exposure meter (for photography) that
will take incident light readings (both for ambient and flash).  The
readings it gives are super accurate for film/camera exposure settings.
However, I have a need to convert the f-stop and shutter settings to
either "footcandles" or "LUX" levels.  I need this conversion for some
scientific testing I'm doing.

Let say, I set my meter to an ASA or ISO of 100, and my meter gives me
an ambient light reading of for a camera exposure setting of F8 @ 1/30
second -- what would be the level of LUX or footcandles of light that
has fallen on my subject?

Does anyone know how to get this information?  I don't want to buy a
light meter that gives these reading in LUX or footcandles, when I
already have a very sensitive meter.

BTW, I know how to convert between LUX and footcandles.

Royce Bair
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