Wow..
All I can say about this Tarot gimbal on the IRIS is that it is amazingly steady. I had the IRIS in some 5-8MPH gusts and had to work it to keep it above the treeline where the wind caught it, and the video turned out really nice and steady. I am now learning at what down angle I have to keep the tilt knob on the R/C transmitter to keep the props out of the video. I have been taking video in 1440 px width at 48fps. I found that the 1920 px width really goes almost "fisheye" on you, and anything less than 1440px width - for me - isn't wide enough.
The ONLY thing about flying with the gimbal is the shortened flying time (about 8 mins) due to the added weight of the extended legs, gimbal and camera, and getting used to the extra throttle "umph" you have to use to get the IRIS off the ground and to reduce descent when flying in STB (or manual) mode.
I really like the way the IRIS arms are designed with a Weaver/Picatinny-like rail system on the bottom. I am very curious if the IRIS arm rail mounting system has the same dimensions as the Weaver or Picatinny rail system.
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I have good luck using 1080P 60FPS (black edition obviously). I then play it back at 48 FPS. It slows everything down just a tad ( same as playing 30fps at 24) and makes action shots look great and the motion blur looks better. It's all preference and the look you are going for. Usually use medium FOV, just depends.
Best GoPro mode to use for me anyways is 1080P 30F with stills every 5 sec and field of view set to medium. You'll get some nice stills out of your video adventures and the medium FOV get rid of any props or legs in the view when flying aggressively.