Does anyone have any ideas about what I could use for an inexpensive optical fin der with a field of view equal to a 25mm lens on a 35mm camera (i.e. same horizo ntal angle of view as a 90 on 4x5, 180 on 8x10, 360 on 12x20, etc...). I've mad e several non-optical finders of various focal lengths out of cardboard, etc., b ut for wide angles they're less than satisfactory for a couple of reasons. I th ought about buying the dedicated finder that Voigtlander sells with their 25mm S kopar lens for their Bessa-L camera, but it's not exactly free. Maybe if I coul d find a cheap little plastic point and shoot with a 24mm lens I could cut the f inder out of it and use that, but I haven't yet found one. Maybe there's an old Graphic finder of the correct focal length that I could use?