"I'd almost take the "meter without the filter" and file it under myth,
too."
All Canon and Nikon and other 35mm SLR's that use SPC (silicon Photo diodes)
for metering (which is 99.9% of them) have Infrared block filters in them
that are bluish green. I removed them from my camera and I'm going to send
it to get it's transmission analyzed.
Hope this doesn't hurt you or your wife's ego, but good exposure with IR
films, especially kodak's, when using the camera's built in meter are the
result of luck and the wide exposure latitude of the film, NOT because your
camera can meter infrared light. The camera was designed specifically NOT to
meter infrared light. I repair cameras/lenses, so I know from first hand
experiences.
Also given the fact that 99.9% of Infrared photos are taken under relatively
consistent "sunny 16 type " lighting conditions, you don't even have to be
that lucky to get a good exposure. Add to this that the most IR photos are
nature light photos where the amount of IR light is very near/proportional
to the amount of visible light. In fact it's kind of hard not to get a
printable negative if you ask me.
And as far as AF is concerned the red filter will shift the focus somewhat
to compensate for the focus. Thus shooting at f/5.6 and using AF basically
solves the focus correction issue.
You can try to meter Infrared light through a built in filter that blocks
it, but its about the worse advice I've ever heard. Better advice would be
to meter the visible light and assume the IR light will be almost identical
for natural light, and a little higher for Tungsten light. Telling people
they can meter infrared light gives them a false sense of security.
Peace, Rolland
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