Does anyone know if the camera lens on the DJI Phantom Vision+ is protected by an outer piece of optical glass/plastic? Whatever is there is not flat (not like a protective filter on a camera, I mean). Rather, after looking closely, I think that there may be a protective dome over the lens. Either it is a protective dome, or it is the outermost of a group of lenses, and thus part of the optical train itself. Thanks for any information/speculation.