Hey guys, I have a bit of a weird problem here. This would seem like a simple Google search but it's too specific for it.

Any ways, my father in law is using a Canon 17-85. Every time we shoot it at 17mm in auto mode, it gives us an Error 99. This only happens from 17-24. After 24mm, there is no error. Also, there is no error in manual mode (from 17-85). We have tested the lens on both a Canon Xt and Xti, same issue.

Now it seems like the obvious problem is the lens. So what else can I do to try and fix this error before we bring it into service?

 

Theres nothing you can do. The electronics of the lens seem to be having issues. Send it in.

 

make sure the electrical contacts are clean.