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Jen,
My 75-300 IS USM is quite decent. It's not the basic one but the next dearest from what I can tell.
I haven't checked to see if it is the same optical configuration with an added usm, or a bit diffrrrnt.
I was testing it the other day for the accuracy of it's focusing and was quite surprised at the detail in distant objects. It's full-frame and being used on an APS-C camera.
That's my grip with makers at the moment because I suspect they sell more small sensor cameras, yet don't make a full choice of lenses for them.
If I haven't deleted them, I will post a photo later. It could be a focusing fault in the lens.
Try it on a tripod and focus using auto and manual and see if there is a difference.
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