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Have you seen that new RX8R with redundancy bus? https://www.horusrc.com/en/frsky-rx8r.html
I'm planning to buy this CamRemote-2 for my Sony A7: http://vp-systems.eu/
Why does no one use an Arducopter (Pixhawk, soon Pixhawk2) based system on their high tier crafts? I really like the open source aspect of it...