gritty feeling when zooming 24-70?
Apologies if this has already been asked, but has anyone ever noticed a gritty sensation when zooming the 24-70? It's a very subtle gritty sensation when zooming towards 70, more pronounced when the lens is pointed down. I wonder if this is just a part of normal "wear-and-tear," or if there are some sand particles trapped inside lens. It's just that I've become mildly more aware since taking this lens to a beach.
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