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Exactly what you said,
"If you can afford it". I would've loved going with the 7D, but because of my situation, the T2i is the next best thing.
Heres a link that explains focus shift: http://diglloyd.com/articles/Focus/FocusShift.html
Heres a survey I found that shows the rate of getting a good lens vs. a manufacturing defect.
http://www.lensplay.com/lenses/lens_defect_results.php
Canon lenses - 12490 with 944 defects
The probability of getting a good lens is 92 %
The probability of getting 5 good Canon lenses in a row is 67 %
Sigma lenses - 2792 with 619 defects
The probability of getting a good lens is 78 %
The probability of getting 5 good Sigma lenses in a row is 29 %
Tamron lenses - 1388 with 209 defects
The probability of getting a good lens is 85 %
The probability of getting 5 good Tamron lenses in a row is 44 %
Tokina lenses - 463 with 74 defects
The probability of getting a good lens is 84 %
The probability of getting 5 good Tokina lenses in a row is 42 %
Nikon lenses - 2273 with 189 defects
The probability of getting a good lens is 92 %
The probability of getting 5 good Nikon lenses in a row is 65 %
Pentax lenses - 1420 with 97 defects
The probability of getting a good lens is 93 %
The probability of getting 5 good Pentax lenses in a row is 70 %
Minolta/Konica/Sony lenses - 633 with 61 defects
The probability of getting a good lens is 90 %
The probability of getting 5 good Minolta/Sony lenses in a row is 60 %
Other lenses - 897 with 94 defects
The probability of getting a good lens is 90 %
The probability of getting 5 good Other lenses in a row is 57 %
I hope this helps
Kyle
t2i Test Outdoors from Reed Rosenbluth on Vimeo.