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.