Archived posting to the Leica Users Group, 2004/05/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Lager says early Summitars have flat diaphram blades that form a circular aperture while later Summitars have domed [forward curving] blades that form a hexagonal opening. He adds that Summitars after Nov. 1945 [@ #587601] are factory coated and from early 1946 [about #611000] have international apertures to f16.-- bob cole