HD means you get 1080 picture on your device while flying rather than the lower resolution 720. On a phone screen it make little difference as the screen is so small, but on a tablet it gives you a better chance to spot things like power lines!
The phone/tablet has to work a little harder with the HD so it will put more strain on the processor/battery but not for the drone itself.
Thanks for the reply. So, in the settings, “normal” will be the lower resolution and might save a percent or two of battery on my phone, but no real effect on the drone?
I was just curious because I’ve only had my Zoom for a few days, but I can’t get the appreciably better range (video transmission at least) than I had on my Air. Farther, yes, but far below what I was expecting. I didnt know if changing that setting would improve the transmission range.