I would like to hear from Sinar rail clamp (2) users: which pan-tilt head you us e. I'm wondering the rail clamp with a Gitzo low profile head (double-tilt) woul d be bettter than with the Sinar pan-tilt head (only single tilt). I know Sinar made this head in this way so that I'm supposed to adjust the other tilt by the rail clamp. But I realized that this would be harder to adjust because I have to hold the camera. Any input is appreciated. Thanks. Masayoshi