Good to know
I must say that weather-sealing for me proved to be more important than I'd ever imagined when I bought the lens. I've been out in a few rainy days, but more important I've had quite the amount of blowing sand and dust to my gear. In those occasions I felt a lot more secure with a weather-sealed lens on my camera. I have used the Sigma 50mm 1.4 in a sandy environment one time and there was sand all over the focus ring and it needed to be cleaned.
In some occasions I didn't even worry about my gear and could pay more attention to taken the photos, which is a great thing. Example of an unsuspected sand-blasting:
Weathersealing ain't that bad 
by
Jan Paalman, on Flickr
Originally Posted by Sheiky
Good to know
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