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Message: <blockquote data-quote="Clovishound" data-source="post: 824599" data-attributes="member: 50197">The subjects I want to use it for are ocean waves splashing among trees in the surf. I looked at the full sized image on my computer. I think I somehow missed focus. I probably was concentrating on the long exposure so much I didn't really pay attention to where the AF was focusing. I just now compared the sharpest part of the image to the 2 sec exposure without the filter I took of the same subject. It is definitely sharper than the longer exposure with the filter. I will have to test some with and without the filter using shorter exposures, and ensuring the tripod is rock stable to see if the filter is the culprit.</blockquote>