This is a problem on my X, in rain, the rear cam is frequently so splattered with dirty water that the image is practically useless. The cam on my 2008 RX400h, on the other hand, doesn't ever seem to get anywhere near that compromised. Camera placement?
Or perhaps there could be a little cover that slides back or clamshell opens when the camera view is required. When water drops or dirt is on the lens, it renders the view ineffective. How will FSD function correctly with no rear view?
A Hydrophobic lens sounds good, but would that stop dirt/snow as well? I have a reverse camera on my current car and it gets really dirty, mostly from water splashing up off the road, so I guess it would? I agree about the Norway snow video, the back of the car gets covered.