For several months I have been searching for a shutter to fit my APO Ronar 480 mm f9 lens. Last week I purchased a huge "Prestor" shutter with shutter speeds from 1 to 1/30 sec (+ B and T). The shutter almost covers the hole lensboard on my Cambo SCN camera. I havent measured the diameter of the shutter opening, but it must be around 70-75 mm.
I have never heard about "Prestor" shutters before, does anyone of you guys have any knowledge/experience with this shutter?