Ok, I know this is a lame question and probably I can't give you enough detail to respond properly, but I'll ask anyway... I have a chance to buy a Wollensak Raptar 160mm, f4.5 lens cell set, new in original box, but they of course come sans shutter. The only other information I have on is that the front cell has a 2 1/8 inch diameter with a clear lens diameter of 1 3/8 inches and the rear cell has a 1 3/4 inch diameter with a clear lens diameter of 1 1/4 inches. Any idea what size shutter this would require and what image circle it would cover? Thanks if you can help.