You don't need any assistance to hold a 300mm f/2.8L unless you are very weak.
I think we all agree on that. I actually handheld both the 400 f2.8L IS II and the 600 f4L IS II most of the time, even with extenders. The need for this bandoleer solution came with the 200-400 f4L 1.4x. It is about as heavy as the 400mm, so from that perspective it is hand holdable. But you need that extra arm to handle the zoom. With the bandoleer, that became very easy.
« Last Edit: November 15, 2013, 01:57:33 AM by Eldar »
1DXII, 5DIV, 5DSR, 8-15/4L, 11-24/4L, 16-35/2.8L III, 24-70/28L II, 70-200/2.8L IS II, 100-400/4.5-5.6L IS II, 200-400/4L IS 1.4x, 17/3.5L TS-E, 24/4L TS-E, 35/1.4L II, 100/2.8L IS Macro, 300/2.8L IS II, 600/4L IS II, Zeiss: 15/2.8, 35/1.4, 55/1.4 Otus, 85/1.4 Otus, Profoto B1