I too have an Air 2S and was frustrated and baffled to discover it switches back to Rec 709 when you set it to do a mastershot. Why? Anyone know if this is something that DJI is planning to enable on an upcoming firmware release? I shoot everything in D-log so it's super annoying to have it flip into Rec709 (and it records as an .MP4 instead of a .MOV as well) when I've made some great moves with mastershots. I feel your pain