Canon Marketing Japan Inc. has posted a lens compatibility notice for owners of EOS 7D, 60D, 50D and 40D DSLRs.
Here is the (rough) Google translation:
Digital SLR camera "EOS 7D", "EOS 40D", "EOS 50D", "EOS 60D" to customers are using
The Canon products patronage patronize you, Thank you.
Products for the title, the lens being eight below (released during the years from 1990 to 1995) when used in conjunction with the surrounding AF ranging Cross in the frame (simultaneous detection of horizontal length) is performed not. Ordered specifications and detect vertical or horizontal line detection.
As well as apologize for the leak was noted from the contents of this manual and I will send details. We look forward thank you for your understanding.
EF35-80mm F4-5.6 II
EF35-80mm F4-5.6 III
EF35-80mm F4-5.6 USM
EF35-105mm F4.5-5.6 USM
EF80-200mm F4.5-5.6 II
EF80-200mm F4.5-5.6 USM
PhenomenonTarget camera, lens when used in conjunction with the above subject, ranging around the cross-frame AF (simultaneous detection of vertical horizontal) does not. Detection and specification of horizontal or vertical line detection. This is likely because the camera's AF and lens on the optical properties of the sensor.
EF lenses and the other being open at EF-S Lenses Lens FNo. F5.6 but until you are all cross-frame AF ranging (simultaneous detection of vertical horizontal) will be.
Apparently, the outer cross-type AF points on these DSLRs do not function properly with these lenses mounted.