>Interesting, an unfocused lens does not change the amount of light coming
>through....Hum?
it does, there is a loss of something like 1/10 stop for most lenses at min.
focus over infinity. If you have a *grey* card, and not a sort-of grey card
with patchy shades of this, that & the other, it should make no difference
whether it's in focus or not.
Simon E.
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