I was at my local camera store Glazier's in Seattle today looking for a step up ring for a 4 3/8 inch WA dagor that I have recently purchased. Do any of you have one? What is the filter size? mine is a serial no. 770--- lens - it seemed to be around 40mm but I am not sure if it is a series filter or not. I spent an hour or more searching through the filter drawers, and step up ring drawers, at Glazier's. My goal is to mount my standard 67mm filters on the lens. Do any of you have any suggestions?