Well I ended up buying the Manfrotto 322RC2 Ball head grip from Loupey. It came in Friday and I have tried my Nikon D90 with the 70-300VR zoom and my D80 with my Sigma 135-400APO zoom and it works with both of them. Now it's time to start using my tripod more. I had to get a adapter for $9.95 to match up the head with my tripod legs but it works fine now. I would like to thank everyone for all your comments and replies and a special thanks to Loupey for selling me the grip, Jeff