Sorry you guys are having trouble but for me this lens is turning out to be my favorite. You can change the zoom in the air which is amazing and it's as sharp as anything I've seen for this format, and the little balance rings on the front of the lens are so easy to put on.
I also have the Olympus 9-14 which is also amazing but you have to land it to change zoom. I'm not sure why it's important for people to have fast lenses on drones as most shooting is during the day which means that light isn't the issue and it's rare to want to worry about depth of field in any shot I've seen from a drone. Mostly you want to find the sweet spot of the lens resolution which is typically a few stops down from wide open. I sometimes wonder about drone pilots trying to learn cinematography which is a pretty long learning road. There's so much misinformation on these forums, it would probably be worth learning the basics and then applying these to these amazing cameras that are now on the
Inspire 2's.