I use a Canon 5D MkII for most of my stills work and took it to Tenerife to record the Starmus Festival.  However, one morning the surf was up on the hotel beach and it was crying out for the Canon’s HD video to be tried out.  Hand-held, with a 100-400mm zoom lens and 1.4x teleconverter, this is what the Canon managed – I think the technology is simply remarkable 🙂