If you cut/saw the second filter slot (the one furtherst from the lens) off the holder you can decrease the chance of vignetting. I experimented with this one time because I had to take some photos with the Cokin filter mounted on a fairly thick circular filter which was in turn on a Tokina 20-35mm lens set at 20mm. This rig consisted of the camera, the lens (which takes a 72mm filter), 72mm circular filter, Cokin stepup ring, large Cokin filter holder with square filter in first slot and second slot removed. Even with all this stuff on the front of the lens I managed to avoid vignetting at, I believe, all f stops.
George Baumgardner - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
