My girlfriend bought me a 350d for xmas. I wanted the Canon becuase I already have a 28-105mm AF Sigma lense that I use on my film rebel. I went and bought a 2gb CF card, put the lense and battery in and started taking pics. After about 10 pictures I began to get an Error 99 message. The manual says that the Error COULD be from using a non-canon lense, and to take out the battery and try again. So I did this and once again began to take pictures. Once again after a few shots, Error 99 . I did some further research and found that this was a relatively common problem. I cleaned the contact points, took out the battery and reset everything and it works again... But only for 30 or so pics.. Then I get an error again. Is this something I'll just have to deal with? Should I return the camera? Get a Canon lens? Any feedback would be appreciated.