It's not that it changes that much, it's just that my camera has no
middle ground. The indicator light for (for example) 1/125 comes on and
nothing happens as things get brighter until it changes to 1/250, which
instantly doubles the foot candle reading. Sometimes it would waver
between the 2 reading leaving me wondering.
Don't get me wrong. That calculator of yours is a wonderful idea. I
should get out my camera and play with it again. I haven't used it in so
long, I doubt the batteries that run the meter are still good. Maybe I
should still get it out, if only to remove the dead batteries.

Steve


Ray wrote:

Steve,

If it changes that much, I'd guess that a couple of things might be
happening:

1. You're changing the percentage of the total field of vision that's on
the white paper. Try to get all of it.
2. You're changing the angle of the lens to the paper surface, with 90°
being the best.

In any case, I'd go more with the higher reading, as that one probably had
the better of the two conditions I mentioned, and while it's easy to fool
the meter into receiving less light than is actually present, you can't read
MORE than there is!