Thanks Brad, I appreciate you taking the time to reply, I tend to think there was something wrong with the lens as I took many pics with it and the majoraty were blurred to some degree.

on a side note I have the opportunity to return my xsi and step up to the 40d for very little money more. berfore the holidays the price difference was much greater. I would guess the low light shooting would be a tad better? plus I could use the xtra frames per sec. for shooting my rocket liftoffs.