Canon UK has indicated on a support page that the Canon 7D, 60D, 50D and 40D have AF problems with certain older Canon EF zoom lenses.
Canon notes:
When using any of eight zoom lenses listed below released between 1990 and 1995 with any of the listed cameras, the peripheral AF points do not function as cross-type AF points resulting in vertical and horizontal lines not being simultaneously detected. Vertical or horizontal lines can only be detected separately.
The affected lenses are as follows:
- EF 35-80mm f/4-5.6
- EF 35-80mm f/4-5.6 II
- EF 35-80mm f/4-5.6 III
- EF 35-80mm f/4-5.6 USM
- EF 35-105mm f/4-5.6
- EF 35-105mm f/4-5.6 USM
- EF 80-200mm f/4.5-5.6 II
- EF 80-200mm f/4.5-5.6 USM
Canon notes the cause of the problem as follows:
This is due to the optical characteristics of the camera’s AF sensor and lens. If the maximum aperture of the EF lenses and EF-S lenses other than the lenses above is up to f5.6, all of the AF points function as cross-type AF points, and both vertical and horizontal lines are simultaneously detected.
[via Canon UK]
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Glad I don’t have any of those older lenses then. Then again, I was a Nikon film shooter so it wouldn’t have effected me anyway