Quote Originally Posted by Sheiky
Do you think I should get my Sigma checked? I mean is it worth the chance? Given that it works perfect on my camera, just the 450D of my girlfriend wont accept it without some front-focussing which can't be calibrated.

Depends on your generosity. "If it ain't broke, don't fix it." But, since the 450D doesn't do AF microadjustment, it probably just means you'd need to re-adjust for your camera once you got it back.