« on: April 29, 2011, 04:31:54 PM »
A filter attached to the front of the lens won't affect dust inside the lens, by the way. Dust "gets sucked inside" from the zoom cylinder sliding in and out, not through some magical hole in the front of your lens.
Not entirely true. On the 17-55 there are two small vent holes in the ring around the front element. People that always have a filter on tend to get less, and smaller particles of dust. People that don't, have found things as large as pet hair and jelly beans (just kidding) behind the front element.