My apologies for being metric but 17-50 weighs 430 g (or so) and 28-75
weighs 510 g (or so). As far as my non-metric knowledge goes, 80 g is
nowhere close to 1/2 pound...
I've Tamron 28-75/2.8 and it seems my copy is outstanding. On Pentax
DSLR it yields angle of view similar to that of 43-110 mm lens, give or
take few mm on the long end. If you get a good sample, it will light
your face with excellent sharpness even wide open. On the downside the
colors are slightly warmer than those of Pentax, but personally, I don't
have anything against that. Also sometimes the bokeh is pretty harsh. It
is however pretty small (67 mm filter thread) and light for this class
of lens (standard 2.8 zoom).
I don't own Tamron 17-50/2.8 mainly because it is not a full frame lens
(or a fool frame lens, if you want to call me that way). But I did
recommend it to a number of my friends and they are quite happy.
It shouldn't be a problem to find loads of (full size) images from both
lenses on sites such as pbase or pixelpeeper.
There is one more thing worth mentioning for Tamron 28-75/2.8. Both zoom
and focus rings rotate the Pentax way. As opposed, e.g., to Sigma
24-60/2.8 which does it the other way around...
Boris
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