I just acquired an old calumet 4x5 monorail and i believe there may be a problem with one of the lenses. The lens is a Schneider Kreuznach 210mm Symmar-S mounted in a Compur 1 shutter. The shutter seems to work fine as far as speed but I'm not sure how to change the f-stop. I'm assuming I should just be able to move the setting but there is resistance and I don't want to force it for fear of really making things worse. Any thoughts or pearls of wisdom that someone can share?
One other thing - can someome tell me what the 'T' setting is for? It's just after the 'B' setting - I'm assuming timer but not sure.