I have been looking for filters that will fit on my Kodak 10" Wide Field Ektar Lens. I did find out that the size is a series IX ( thanks to a previous post). Over the past three months I have had marginal luck finding the filters that I want. The hardest seems to be anything in a 25 or 29 red. I have ordered from B&H with no luck. I have gone to Tiffen with the same results. It seems you must order from a reseller and wait at least two or three months to get a filter. I have thought about having a adapter made from S.K. Grimes to use a standard size filter. Can anyone tell me where to find series 9 filters ? Also would the idea of using an adapter be a good idea or will I run into the same problems? Thanks for the help.