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Tamron 28-75mm f2.8 XR Di Zoom AF

28-75mm
Review Date: Aug 23, 2005 Recommend? no | Price paid: $450.00 | Rating: 9 

 
Pros: Price, Sharp, f2.8, Built Quality
Cons:
heavy Front Focus under 40mm, very warm color, no FTM

I tested four copies of this lens on 350D side-by-side. ALL of them are heavy front focus under 40mm. Their serial numbers are differ by 1000+. I tested them on 3D objects (MLU) and real world, shot over 100 pictures per lens with and w/o 580ex.

Over 50mm, all focus near perfect. Very small amount of both FF and BF. Can't notice over f4.0.

All copies are equally sharp over f4.0 with the whole range, just one copy stay as sharp @ f3.2.

All copies are very warm color, esp with AWB. 1 copy has least contrast, which happen to be the best AF one.

All copies have very little to none CA @ f3.2, but some Flare.

If you don't mind zoom-in to AF everytime, it is the best lens in its class.