I have been flying cx760 for video, and 7D with 10-22 for stills. But will be putting my trusty 5Dmkii up in the air soon, and looking at various lens options. I already have a few L lenses, but too big to fly with. Also have 2 that I will test the 24-105 f4 IS which is pretty wide at 24mm (ideal wide for video IMHO, although wider lenses are of course available) , and will test the 8-15 f4 (fisheye should be interesting). I will also look at buying a dedicated prime like a 28 f1.8 or 35mm f2, or even 35 f1.4 L or 24 f1.4 L . Problem with all these lenses is that they do not have any IS (usually do not need it for such wide angle lenses), but for use on flying multirotor IS may be nice to have. In which case, the lens I already own is the widest IS L lens I know of (24mm with IS should be sweet).