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In wet/snowy conditions, I use a stubby holder (wetsuit material) with the bottom ripped out around. Slide it over the lens housing. Stops the moisture getting into the AF mechanics. And when you put your camera away and pull out a beer, well….you’re sorted!
Excellent, practical advice!
I should add that in rain I do tape a plastic shopping bag to my lens (onto the shade cover) to prevent most of the water getting on it. I also like those umbrella hats to help keep moisture off the lens.