I have a 17-55 that I believe front focuses.
As an example. Here's a SOOC shot of my daughter from a recent session I did with her:
Here's a 100% crop from that picture. Note how the suitcase is sharp, but her face isn't. In this case, I set the focus point to her left eye. I was not focus and recomposing.
The shots were taken with an off camera 430ex. shutter speed is 1/200, f-stop is 5.0. I choose this shot simply because it is a good illustration of the issue, the other shots also have this problem.
This front focusing seems to happen on all pictures I take where the subject is more then 4-6 feet away. I've taken over 1000 shots over the past few months to confirm this. When the subject is close, it's very sharp. But past a certain distance, the lens starts front focusing.
I've done tests with IS on and off and it has no effect.
My other lens is a 50mm 1.8, and it does not have this problem at all. Subjects at 6 feet and beyond are sharp.
I've also confirmed this with focusing test charts which I can post if you guys are interested.
I sent this lens in to be serviced by Canon with a detailed description of the problem.
Today, I received the lens back from them with the following note:
"Your product has been examined and no problem was found as the lens was within factory specifications. Inspection and cleaning were carried out on the lens."
I'm incredibly frustrated that they didn't even bother to email me when they couldn't recreate the problem. I feel like I wasted a bunch of money having it shipped there to have them dust it off.
Has anyone else had similar issues with canon service? Does anyone have any suggestions as to how I can get a working 17-55?
Thanks everyone for the advice to send the body in with the lens. Although this seemed to confuse the service center at first, after 4 phone calls and two weeks of back and forth, they finally put the lens on the body and tested them together.
According to them, the combination was front focusing by 15 centimeters. They adjusted the 17-55 and returned the set. Images look much better now.