In reply to Mr Lopez:
I've got no doubts that any headcam footage I could produce would be top quality shite that would be virtually unwatchable, and probably vomit inducing due to the movement. Which is one of the reasons won't be mounting it on a helmet, as I mentioned at the start of the thread.
I have emailed Petzl, Black Diamond and Wild Country and they have already answered the question (see the text in the thread above).
In short they don't know because they haven't done any testing.
As for looking stupid, camera on helmet is just one in a long line of faux pas, and probably not the worst, to list a few; multi coloured lycra capri pants, ron hills, woolly jumpers, shit haircuts and sin of sins clambering around abandoned northern quarries with no jumper on.