I have just received the 7D and I am not impressed. I have been shooting for years . All canon slr then dslr. I have the 100 to 400 isl lens and have yet to take a decent picture with it. My older rebel xsi takes beautiful pictures with this lens. I tried my 100 macro lens. Still terrible pictures. The shutter is noisy compared to the XSI. Do you think I have a defective camera? I have the tamron 18 -250 and it can not focus with it either. I don't know what I am doing wrong. I haven't tried the 18-55 lens yet but i never use that lens. I have the 70-200L 4. i really haven't used that one much yet but it is not my most used lens. I use the 100-400 for the birds and the 100 for my flowers. these are my favorite lens. I was fixing to order the newer 70-2002.8 II lens but I'm not sure what to do. I am thinking of stepping up to the Mark 5.
Thanks for asking, sorry so long replying we were at the camp since Christmas.
I returned the 7D got the T2i and love it. I also got the 70-200 is 2.8 ll. I may try the 7D again in a few years or something a little larger. I like to hand hold so supporting a large camera and a large lens is tough with arthritic hands. My children got me a neat device for Christmas that helps take some of the support off my palm/thumb. It looks like a plastic gun-stock with a screw for mounting to camera or tripod mount on lens. It has taken some getting used to but has helped the hurting hands. He got it at http://www.agonic.com Called stedi-stock I wouldn't recommend it to a professional but for those that have specific needs it works. I can't load their site today though. I have the 400mm lens and without IS I cannot handhold. I am hoping they will add IS to that lens soon. I will try the stedi-stock and see if my hand holds are better. This photo was taken today out the window of a truck hand holding with my 100-400IS with the T2i. I know it could be sharper but was a quick shot then he was gone.
I have the 7D, but not the big lenses (yet?). I have the 70-300 IS USM for my longer lens. It was a VERY difficult transition for me from a Pentax 100D super, but I'm doing better. I get frustrated because I want 500mm results out of it, Ha.