Help needed! I'm searching for a new tripod to use with an Arca-Swiss F Line Field camera with lenses up to 300 mm. The Gitzo line seems most promising, but I find the product descriptions posted by the company and retailers less than illumintaing. I'd appreciate some advice. The only criteria besides holding the camera securely and stably would be this: I like the idea of a variable leg spread but dislike the spread available on at two or so click stops.