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Title: First "high end" lens
Review: I'm using the lens on a XSi. I'm still reviewing, but my initial thoughts are the focus isn't quite as sharp as it could be? Very low distortion, CA, etc. Sometimes I just can't figure out why some of my images are a tiny bit out of focus. I'm an amateur photographer, so it might be bad hand holding or some other beginner mistake. But, since I bought it, it's mostly stayed on my camera.This isn't a good indoor lens without a flash. The f4.0 is just a little too slow unless it's bright indoor light.I plan to shoot more with the tripod to push it all the way to my limits. Then I'll either come back and bump up my review, or bump it down. This is a pricey lens.
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