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Message: <blockquote data-quote="hark" data-source="post: 383502" data-attributes="member: 13196">I haven't used mine in a long time--since I have the 'P' version, I cannot comment on how the Pro-Z version works. The way they used to work, and most likely the way they still work, is that the filter holder gets mounted onto a lens by the use of a filter ring. The ring screws onto the front of the lens. You mentioned his lenses take 42mm, 52mm, and 77mm filters so you'd need one of each in order to mount the filter holder.Looking at Cokin's web site, the 'P' size offers filters that will accommodate up to 82mm filters (the overall diameter of an actual Cokin filter is 84mm). With the use of post processing, he should be able to cut down and/or eliminate any vignetting that might occur.And Cokin also makes a second filter holder that is designed to cut down on vignetting when used with wide angle lenses such as a 20mm lens. If his wide angle lens is the one that accepts a 77mm filter, you might want to get the special filter holder at some point in the future--the item is P Wide-Angle Holder (BPW-400A).  A wide angle lens would be more prone to vignetting than a normal or telephoto lens. Here is more info on the 'P' system: <a href="http://www.cokin.co.uk/pages/cokinP.htm" target="_blank">Filters for Photographic Lenses - Creative FIlters - www.cokin.co,.k</a>I haven't compared prices but wonder if the 'P' filters might be a little less expensive than the Pro-Z ones.Matt Granger mentions using the 'P' version, and his filter sizes take up to 77mm, too.[MEDIA=youtube]ahSBY-IqNIk[/MEDIA]</blockquote>

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