Chris Light
Veteran
to add to Zaza's referenced description of a fluid head, "friction" heads are sometime referred to as "fluid" heads. beware. since grease is technically a fluid in the marketing sense, some companies are in the wrong, and are marketing fluid-TYPE heads without disclosing how they really function. i haven't found a "fluid" head under $100 that functioned without a certain amount of friction and/or grease. and don't ever test a tripod head in a store without a camera on it, but that's just common sense 
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