Archived posting to the Leica Users Group, 2004/05/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]My later Summitar (the one that started this whole mess) has # 754xxx, with many flat aperture blades (looks like 10) making a very round hole. The quality of the bokeh sometimes seems very nice, sometimes less so. Of course, I don't generally take notes or do tests, so it may be that some apertures look nicer than others. I suppose it might be worth me taking notes for a couple of rolls to figure out what apertures produce the nicer bokeh. Has anyone else done such tests on their Summitar? -Aaron >Thanks to "Thinkof Cole" and also to Michiel Fokkema for your trouble. > >My Summitar has a serial No 721xxx which I believe is still quite early >1948? . When I get it back I will look to see if the iris blades are flat >or curved and then try it !!!! > >Regards Claude Hayward >Thinkofcole@aol.com wrote: > >>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