Noel, Thanks for the information. The explanation from Kodak makes sense, a one size fits all, or rather nothing at all, without one of several adapters. In their infinite wisdom, Kodak created an adapter nightmare. You save money on filters, but have a bagfull of adapters. That was a great marketing tool for the sales of adapters!! I know this, because I've probably acquired over a hundred various "rings" over the last 40+ years. Art Tafil