Greetings- first post, so apologies if I manage some faux pas. Query: does anyone here have some advice re Vanguard GH tripod heads? I have an OMD5 and use the HLD-5 grip with additional battery 100% of the time. In addition to the Oly 14-42 and 40-150 zooms I have a collection of Canon FD and Nikon F-mount lenses with adaptors. It's wonderful being able to freely use this legacy gear on the same body. For the last 20 years I have used a Manfrotto 3-way tripod head. It has served well, but it is a pain to try tracking moving animals or sport photography. So I have been looking at the Vanguard GH ball heads. The adjustable pistol-grips look more user friendly than the Manfrotto 322RC2, and I can get the GH-100 at less than $80 Australian (bargain!). I have two concerns. The first is specific to GH heads: how secure are they against the camera rotating when in portrait orientation? Unlike Manfrotto, Vanguard rely on a single mounting screw and the ridged rubber on the plate to prevent the camera twisting. There is no secondary nut to tighten the attachment. The heaviest lens I am likely to attach is ~400g (100mm FD). I am worried that the lens will turn on the mounting screw, or I will risk over-tightening it in the first place. Which leads to the second question: how much weight can safely "hang" off the HLD-5's tripod attachment? I have a couple of 135mm lenses that weigh far too much (Soligor = 530g!) but I have niggling doubts about the 100mm. It is surprisingly difficult to find non-contradictory advice on this topic. Many thanks.