Pmolan Senior Member 521 posts Joined Nov 2008 Location: New Jersey More info | Jan 06, 2010 20:37 | #1 Almost everyday I read "Cheap UV filters degrade image quality". At the same time I read in the sell forums. "There is dust behind the front element but does not affect image quality". This is especially prominant with the 17-55 IS. EOS 50D | 17-55 f/2.8 IS | 70-200 f/2.8 IS L | 100mm f/2.8 macro | 580EX | 430 EX | 430 EZ | Team Buff!!
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PhotosGuy Cream of the Crop, R.I.P.  More info | Jan 06, 2010 23:29 | #2 Filters cover the entire area of the lens, & the two extra surfaces can promote flare. Dust doesn't. FrankC - 20D, RAW, Manual everything...
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tzalman Fatal attraction.  13,497 posts Likes: 213 Joined Apr 2005 Location: Gesher Haziv, Israel More info | Jan 07, 2010 05:18 | #3 Most dust doesn't enter the lens from the front but rather from the gaps between the focusing and/or zooming barrels. Elie / אלי
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