650D/T4i with Tamron 70-300mm VC

While waiting for your replacement 650D/T4i (sorry!), I have some reassurance to give regarding Tamron's performance paired with the T4i/650D; I just compared a T4i/650D Live View shot taken with a new Tamron -- not the 70-300 VC, but a 17-50 VC -- at slow shutter speed, 1/25 sec. , to a "regular" AF 1/25 sec shot (same camera/lens, both at f/2.8, 50mm), and the Tamron executed beautifully with the T4i/650D's Live View AF, better than regular AF in this comparison, part of my unscientific lens assessment: hand held casual shots of my usual testing subject, the dog.

Note: As Yogi pointed out (in another thread), the regular AF shot (AI Servo, Center Pt) looked rather soft (straight conversion from raw w/o further pp), but I put up a T4i 100 % crop to show slow shutter speed lens performance, and was very impressed with target sharpness overall at typical size (also shown in that thread - http://forums.dpreview.com/forums/readflat.asp?forum=1029&message=42193202 )

Live View performance with this combo turned out even better (again, hand held, slow shutter speed ) :

My other lenses are Canon's 70-200 f/4L IS, 85 f1.8, and a Tamron 28-75 f/2.8.

I hope this information is helpful.

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photo sampling @ http://www.flickriver.com/photos/sbmgar/popular-interesting/