The question was asked on another thread about how weatherproof a D800 is and I think this deserves a separate thread regarding all Nikon cameras.
I am now testing my Ewa-Marine U-B 100 Underwater Housing. This is IMO such inexpensive insurance when we have a several thousand dollar investment. For example, with the D4, 16-35mm f/4.0 VR, last night in the ocean surf, the camera was dry even though I was soaked to the waist. But, a surprise shower began, and by the time I walked 100 feet to the motorhome, I was soaked all over and the Ewa-Marine was covered with water, camera inside and dry.
Another item which I will use, if the opportunity presents, is the LensCoat RainCoat Pro which will cover the Big Bertha when I attempt, and I mean attempt, a sunrise with 800mm. The salt spray and poor conditions around the ocean, suggest once more, protection of the equipment is always a good practice. And, the front of the lens will be very careful cleaned post shoot, so as to make certain no residue persists. Also, if the wind is in my face, off shore, the shoot will be cancelled, as I see no reason to have the wind blowing all the ocean crud on me and my equipment.
So, others may have their preference regarding how to protect the equipment when we are shooting in less than ideal conditions. This is the time to share all the great ideas NRF Members have in their heads. It just makes sense to me to prevent damage rather than to try and play catch up after the fact.