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Message: <blockquote data-quote="eurotrash" data-source="post: 77093" data-attributes="member: 9237">An ass-gasket is a little rubber dingy that goes around the mount of a lens. It's shown here on the 16-85. Supposedly, it helps to seal out environmental things like dust and perhaps some rain. I'm sure that at some point, someone tested a non-sealed lens vs a sealed one but I can't confirm or deny that they work well. I've only ever shot in the elements with a "sealed" lens so far.<img src="http://i481.photobucket.com/albums/rr172/playsguitars/Photography/Sub Album - Lens testing/IMG_0295.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>