This is the awesomest of lenses. Put a dust filter on it, and you never have to worry about it. Great price.
Sorry, but that is complete BS. Most of the time the dust gets inside when zooming in and out. The lens has to breathe, and there is no sealing at all on this lens.
I have had 3 copies of this lens and have used B&W UV filters on them since day one. 2 out of 3 of them have had significant dust under the front element within a month. I have not been shooting them in bad conditions at all. The lens has great IQ, but it's built like a 300 lens. Not like the $1200 I paid for it. If you end up getting this lens, there is a large chance you will be sending it in to canon and paying them to clean it for you unless you take the risk of taking the front element off and cleaning it yourself.
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