Bought a new Canon 100-400L lens yesterday. Shot two hundred pictures and couldn't get a sharp picture to save me. None out of the lot. Took it back and exchanged it for another one. Shot over 200 hundred pictures with it today. Got 2 sharp pictures from it. I'm actually laughing because my 7D eats lenses. This is now the third time I've had a lens my camera doesn't like. With My first 24-105L I had the same problem. Pictures just come out looking all smudged. I love my 7D but I'm convinced Canon knows there is a problem with more than just a few 7D's not liking certain lenses. So now I'm back to the store on Monday to exchange it for a 300mm f/4L IS. Well below is one of the only three shots I got that was sharp. At least the lens left me something to remember it by.
Heron1 4-6-12 by Guitarman Photos, on Flickr