I ran a 30D and an XT and experienced problems...
I ran a 30D and an XT and experienced problems. Of course the logistic problems were totally my fault and with some more careful planning could have been easily prevented.
I went down into Carlsbad Caverns, New Mexico with my 30D and my XT and several charged batteries from my kit. I also brought my remote release for the 30D.
I don't know why I didn't monitor which batteries I was taking with me or that I only had the remote for the 30D along. I guess that my head was "you know where".
Anyway, of course the battery in the 30D went dead and I realized that I only had XT batteries with me. That would have been O.K. except that I didn't have the remote for the XT, only the one for the 30D.
I certainly didn't want to make the trip to the surface so, I just had make-do with the equipment I had on hand...
However, all was not lost... I used the self-timer to expose my Cavern images. It was a bit slower than I wanted to work since the XT has only a 10 second timer. I also learned to be more careful when using cameras that take two different sets of accessories.