Kevin Briggs said:I wonder how many of those I would need to lift my little Panasoninc pv-gs150 above a shoot.
it's something less than 1m3 Helium or about 40 average (small) ballons filled with pure Helium at 0m above sea level. (I don't know the big ones you're talking about - I once wanted an RC-zeppelin to be constructed but it would have cost abour 30'000 USD...)