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Message: <blockquote data-quote="Dave_W" data-source="post: 106484" data-attributes="member: 9521"><p>It really depends on your photography. If you truly need true ND grad filter for your landscape images then you should purchase a physical filter and not attempt to reproduce one via computer. Software does a nice job but it pales in comparison to the actual thing. The square Cokin grad filter system a is far more general filter system than the round ND grad filters because you can move them up or down or sideways to suit your particular landscape scene. And in the long run it works out to be more cost effective than buying the individual circular filters.</p></blockquote><p></p>