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Message: <blockquote data-quote="DraganDL" data-source="post: 248730" data-attributes="member: 18251"><p>These are actually the "converters'' (often erroneously called "filters" or "lenses"). Some are designed to be mounted at the rear end of lenses, others are designed to be mounted at the front. Wide, tele, and macro/close up. Generally, those designed to be mounted at the top of the lenses (using a filter thread) tend to degrade the optical quality of your "system" by raising the level of vignetting, distortions, CA and softness, though I've seen some good photos taken with standard-prime lenses + "macro". Here, in Serbia (where I live) the most popular producer of such "addons" is Cokin.</p></blockquote><p></p>