I'm into airshow and aviation photography and video. My Canon 30D is getting a little long in the tooth so I have a new a6000 as well as the PZ 18-105mm F4 G OSS. I have a decent HD camcorder for video, but it uses an oddball format, so I'd like to retire it as well as keep my kit simpler. I will be renting the FE 70-200mm F4 G OSS next week. I'm a little concerned that the best native lens is just 200mm. Before I go too far down the Sony path, I'm wondering I should keep my existing Sony combo for travel and general purpose only, or is there/will there be a path for getting a longer lens? Remember that a fast autofocus is key when dealing with aircraft in flight.