Bob Talbot <[EMAIL PROTECTED]> napisał / wrote:
>
> 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
>
Yes - all explanations you have given seem plausabile. I would also
suspect that the Tokina must display more vignetting wide-open than
the Tamron.
Jarek
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