The wind is the biggest problem but the length of the lenshood on the Nikon 70-200mm F2.8 helps. Have also used the Nikon 14-24mm in the rain but the lenshood is no good on that, so take a cloth to wipe the front element. A plastic bag and rubber bands work quite well, so I've been told but a waterproof camera bag is a must, and I use my DryZone bag for that.
