| Re: sigma 10-20mm....which filters?
be aware that wide angle lenses are very prone to vignetting , particularly if they have a convex front - like the 12-24, not sure if the 10-20 does or not.
i would recomend that you avoid stacking filters and if you cabn afford it invest in either a cokin p or lee filters square filter system which are less prone to it than screw ons
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