A while ago I sold my old tripod with its integrated ballhead and bought a new hi-tec carbon-fibre tripod from Velbon. So, I attached a ballhead that I still had in my shelf... and it shakes like hell. It is quite obviously not the tripod but the ballhead in itself. Well, I mounted a huge 560mm Leitz Telyt with a Canon EOS 1v with the heavy Powerbooster attached on it... about 5 Kilos, and no stabilizer, of course. What kind of ballhead wold be a good compromise between weight and stabilty? The combo with the EOS and the Telyt is the heaviest equipment I have, but of course it is prone to vibration.