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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 501621" data-attributes="member: 13090">An Optical Low Pass Filter is an anti-aliasing filter that is designed, specifically, to blur detail. That, in short, is the sole purpose of the AA filter, to blur the image. This blurring changes the frequency of patterns that are passed through the lens to the sensor and in turn helps prevent moire. Sharpening done in post', on the other hand, works by making edges in your shot appear more defined by darkening pixels that are already dark and by lightening pixels that are already light. This creates a crisp edge between light and dark portions of the image, giving it more contrast. In effect, it's an optical illusion that gives the impression of sharpness......</blockquote>