There's an airshow coming up at Joint Base McGuire-Dix-Lakehurst near my home in May. I haven't shot an airshow in quite a long time - during my later film days the 1990s. I could use my Pentax K-5 IIs or K-3 with my DA 55-300mm f/4.0-5.8 (450mm effective at the long end). or I could use my Olympus E-M1 with my Lumix 100-300mm f/4.0-5.6 (600mm effective at the long end). Any advice on which kit to use or any reminders about technique? This will be hand held work.