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As with all filters they have their pros and cons. I don't use mine as much as I used to but that's not software related. Dirt and flare are the main problems I've encountered in addition to vignetting and Stephen's point no 4 with wide angle lenses. Great for reducing those unwanted reflections and seeing the effect through the viewfinder as you turn the filter. I certainly wouldn't leave any filter on a lens least of all a polariser but it is an essential in any photographer's kit bag.
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