I sent in my 7D and 85mm f/1.8 lens 3 times now for front-focusing problem. A "supervisor" on the phone said that at f1.8 aperture, everything beyond about 6ft should be blurry because the lens is not designed to focus anything farther than that at f/1.8 and that if I wanted to shoot subjects farther away, I have to close down the aperture.
I could not believe what I was hearing from a "supervisor". I was speechless. I thought the lens could focus to infinity at any aperture. Am I wrong?