I just picked up a Gitzo Explorer G2257, it came with a Rationalle 3 head. The tripod seems solid enough for my Linhof Technika IV, but the head is a little light. I have a Rationalle IV head, but it is too big and doesn't allow me to drop the bed to use a 90mm SA on the camera. Any suggestions, a quick release would be nice. My previous tripod was a 1967 Davis Sanford Compact which had very early concept quick release, it is wearing out, I bought it when I was 16, worked quite well with 4x5 field cameras. Thanks for any suggestions.