Canon is admitting that it is having some issues with the Autofocus Module on certain Canon DSLR Cameras when using certain lenses. The folks over at Photo Radar are reporting that Canon has confirmed that there are some problems with the Canon Eos 7D, 60D, 50D and 40D DSLRs when using certain lenses. The problem seems to be that some of the peripheral Auto Focus points are not functioning properly. These Auto Focus points are designed to work as cross type sensors but they are not working properly. This is causing a problem resulting in inaccurate focusing.
The following is the text footnote located on the Canon USA’s website for the Canon Eos 7D
With some lenses, the peripheral AF points may become sensitive to either vertical or horizontal lines (they will not function as cross-type AF points). These lenses are: 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/4.5-5.6, EF 35-105mm f/4.5-5.6 USM, EF 80-200mm f/4.5-5.6 II, EF80-200 f/4.5-5.6 USM.
There is no information at this time about when or if Canon will offer a solution to this situation.