> What does the camera's meter say? If you point both at the same
> blank wall under the same light, and the camera picks the same
> exposure level for both, don't worry about it (try it with and
> without the filter if you like, but an SMC Haze shouldn't matter).
> Jim
The two lenses could have the same f-number but different t-numbers
... due to transmission
The strict definition of f-number may relate to axial "beams" of light
only. Perhaps the prime lets more light through *in total* across the
whole area
The camera could be telling lies, or at least passing them on from the
lens.
Maybe the zoom is not really f2.8 after all ... the camera alone will
not tell you otherwise.
I've noticed too that certain lenses do appear to be "brighter"
aperture for aperture than others. It makes them a pleasure to use
and gives the feeling of quality ...
Bob
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