I never would have tried this before with anything but my Nikons, and I wasn't all that eager to try it now with my new M, but I suppose it was time to take the plunge. I had it out last night in a driving rain for a client shoot, using the Lux 35mm f/1.4 FLE. Neither camera nor lens seemed to suffer from the experience even though both were soaked. I will test it more systematically this weekend, but I think the camera survived--and the lens, which I was more worried about. I won't push it any farther than this, though. I was in Tewksbury, MA.