Thor, I've been using large "P" and the smaller Cokin adapters and filters on various Lenses up to 82mm diameter, stacking as many as three filters without vignetting. Have had some problems with errant light reflecting off the back of a filter and onto the film. The Cokin lens shade doesn't surround the filter well enough to seal or shield as a conventional screw on filter and hood would. Generally, the Cokin system works well and the graduated ND and polarizers are priced right and easy to use but are far from perfect for every lighting situation. I have a Bay III adapter and use the Cokin on my 2.8F TLR as well. Hope this helps a bit... Health, Peace Lance Selma, NC 27576 ~~~~~~~~~~~~~~~~~~~~~~~~ In a message dated 5/4/2008 5:28:48 P.M. Eastern Daylight Time, tlegvold@xxxxxxx writes: There appear to be several companies selling filter holders (i.e. a set of slots to mount on the lens to accept 100mm filters). Lee Hi-Tech Tiffen Cokin others Maybe even Rollei makes something like this, I don't know. What I'd like to know, is what people finds works well with the system 6000, for outdoor use (landscape, cityscape, etc), with both Bay VI, 77mm (40/3.5 S-A) and 95mm (90/4 APO-Symmar). I expect to use primarily graduated filters, perhaps a B&W color filter once in a while, nothing more. Cheers, Thor **************Wondering what's for Dinner Tonight? Get new twists on family favorites at AOL Food. (http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)