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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