Has any one had a problem with vignetting with the Lee Filter system when used o n large format images taken with wide angle lenses. I find that when I use a fi lter (e.g. a polorizer) in the Lee filter holder over a center filter(screw-in) with a 120mm Nikkor, images over 6x17(e.g.6x24) have vignetting from the holder. Also, the lense shade cannot be used. Maybe the answer is to just use screw-in filters, but I find the rectangular filters easier to use and have adapted it for all or my lenses. Any ideas are appreciated.