>To put a cap on this; it seems to be the lens that is causing >my problems. I was using my Sigma 70-200 last night and it >lost communication with the camera at least a half dozen times >during the shoot. To get everything back working I would have >to either re-mount the lens or shut the camera off and >re-mount the lens. Very annoying to say the least. Since >this is the only lens that I am having this problem with, it >will be sent back to Sigma for repairs. Lens is still covered >under warranty, thankfully. > >Thanks to all that commented on this, especially Russ. I >likely would have found the problem but the suggestions here >shorten that time frame. > >Kerry
What year lens do you have? HSM or HSM II?? There were issues with the early 70-200 Sigmas, I believe fro reading pre-2005 which had the same symptoms. If it is the lens, it should be reproducible on another camera if you have one.