Tamron 28-70mm F3.5-4.5 44A

     My copy of this lens is in excellent shape.   Focus dampening is excellent.  On the T2i it handles well except that is difficult to access the aperture ring w/out accidentally nudging the zoom ring. I've heard some say that the lens feels cheap.   I disagree.   It does have some plastic on the exterior but it it solid internally.  

     I've done some quick testing, mostly at 70mm.   This is a close focus lens.   It focuses closer at 70mm than at 28mm.  Resolution tests on this lens suggest it is sharpest from 50mm to 70mm from f5.6 to f11.   Those tests also suggest it is somewhat soft at 28mm wide open.   I must agree with those findings.   Those tests suggest that it is soft in macro though.  This is I disgaree with.    I found it to be quite sharp at 70mm wide open in macro range..   

     It is a little soft at 28mm f3.5.   That's okay,   it was never meant to be a pro lens and it is sharper than many 28mm primes..   It is capable of excellent images.   Color rendition is accurate.   I did not see any vignetting and only a hint of fringing.   Contrast is excellent at all settings.
     Since it is an adaptall lens it can be adapted to most cameras.    

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ISO 400 - f4.5 - 70mm - 100% crop

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ISO 800 - f4 - 50mm - 50% crop

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ISO 400 - f4.5 - 70mm - 100% crop

Banana top. 

I think it looks like a hedgehog

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ISO 400 - f4.5 - 70mm

Coming

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ISO 400 - f5.6 - 70mm - 100% crop

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ISO 400 - f4.5 - 70mm - 100% crop

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ISO 400 - f4 -28mm