This is a Wollensak Raptar Wide Field Graphic 210mm f :6.8 to f:45.. The barrel thickness with diaphragm that lens elements were in is identical to the thickness of the Alphax shutter.. So absolutely no machining was necessary.... I separated the elements front and rear an put them in the shutter.. The diameter range of the iris in the now modified shutter is actually greater now than it was in the barrel.. jc
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