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<blockquote data-quote="hark" data-source="post: 733062" data-attributes="member: 13196">If you put an adapter ring on your lens, you will want to get a step up ring, not a step down ring. A step up ring means the filter is smaller than the diameter of the lens. A step down ring means the filter is larger than the lens. It's better to buy filters in the largest size you might need and buy step down rings to accommodate smaller diameter lenses. As Sparky mentioned, it will probably cause vignetting. I tried using a CP filter on my wide angle zoom - full frame body with 18mm lens. It didn't work well. A CP filter (circular polarizer) will alter the color of the sky only when you are facing a certain direction to the sun. And while that sounds good, the problem is the view from a wide angle lens is greater than the area of the sky that gets changed in color. So part of the sky is dark while other parts are light. It makes the sky look kind of splotchy.</blockquote>

[QUOTE="hark, post: 733062, member: 13196"] If you put an adapter ring on your lens, you will want to get a [I][B]step up ring[/B][/I], not a step down ring. A step up ring means the filter is smaller than the diameter of the lens. A step down ring means the filter is larger than the lens. It's better to buy filters in the largest size you might need and buy step down rings to accommodate smaller diameter lenses. As Sparky mentioned, it will probably cause vignetting. I tried using a CP filter on my wide angle zoom - full frame body with 18mm lens. It didn't work well. A CP filter (circular polarizer) will alter the color of the sky only when you are facing a certain direction to the sun. And while that sounds good, the problem is the view from a wide angle lens is greater than the area of the sky that gets changed in color. So part of the sky is dark while other parts are light. It makes the sky look kind of splotchy. [/QUOTE]

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