Don Weiss wrote...
...If lens designers went around calling their lenses by the
geometrically defined aperture, and those lenses
reported the same to their camera bodies, how
could the designers of the exposure electronics know
how much transmission loss to factor in?
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Wouldn't the basic exposure information going to the camera be based on the
actual light going in with the aperatue held full open and going through the
lens? This would factor in any light loss due to transmission loss, just as
if you had placed a filter over the lens. Of course for hand held
metering, it would be off, but I'm assuming even a bad lens has no more than
1/2 stop of light loss due to the glass.
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