--- In [EMAIL PROTECTED], Ken Durling <[EMAIL PROTECTED]> wrote:
<snip>
> Just what is it that gives a lens "contrast?" And why should there
be
> a difference between primes and zooms?
The more elements you have, the more opportunities there are for
internal reflections (flare) which is what really *kills* contrast.
Zooms tend to be much more complex optically, they always haver more
elements and groups. Antireflective multicoating has helped a lot,
but when it's applied to the primes too, guess who still has more
contrast?
<snip>
> Sharpness my lay mind can understand, because of the relative
> stability of the elements (at least that's what I think) but
> contrast?
The simple act of light passing through a bunch more glass tends to
knock down the difference between the lightest parts of the picture
and the darkest, which is what contrast really is. All things being
equal, a lens with a simpler optical formula will exhibit more
contrast than a more complicated one with more elements.
MadMat
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