....The best source I can recommend is SRB in Luton, England. They provided me with a nice and cheap push-on fit adapter for my Ektar 203 7.7 that takes the 52mm filters and shades which I tend to use with most of my other LF lenses for 5x4in format. (75, 135, 150, 180). The only ones I can't use with a 52mm with are the Nikkor SW90, S.Angulon XL90 and S. Angulon 121, because they have such large front elements. In the case of the 90XL, it is excessively large. Although a superb lens, I find it a struggle to use with my 5x4 Linhofs.
--Peter Hamilton, 2003-09-16 10:33:51