From: shannon stoney (sstoney@pdq.net)
Date: 04/13/02-06:27:32 AM Z
>I suspect that the formula you read didn't translate to the simple code of
>an email. Surely it must reformulate to:
>
>Divide the f stop of the pinhole (f420 in your example) by some fstop on
>your meter (keep things easy and pick f42). You'll get 10. Square this
>number (10 times 10 is 100). This is the exposure factor between the two
>apertures. Now multiply the metered exposure by this factor. If the meter
>said one-fifth of a second at f42 then one-fifth times 100 (that would be
>100 fifths or 20 seconds) is your calculated exposure.
Aha! The formula actually came from a book, but I bet one of the
twos was meant as exponent rather than a multiplier. Thanks.
--shannon
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