I suppose this is not entirely off topic because I am considering to buy one
for my Pentax film cameras (since an affordable K/A15/3.5 is impossible).
However, there is no review I could find about the Tamron, other than the
pretty low score (2.6) from Photodo. There are many happy Sigma users but
someone who owned both said the Tamron was optically better, while Sigma
should be used at f11 but had better built quality. So, anyone here actually
used any of these lenses? I am particularly interested to know the
light-fall-off issue (gone at which f-stop?) and wide open sharpness.
Alan Chan
http://www.pbase.com/wlachan
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