G
Guest
Much has been said about "bokeh", or out of focus images. The 11/96 Popular Photo test report says that the current Elmar 50 2.8 has a 6-bladed diaphragm, previous ones had 9-bladed and more. I have an older SM 50 2.8 Elmar that has a 15-blade diaphragm. PP says that many claim more blades make for a rounder diaphragm opening with better bokeh.
Also, Minolta in a brochure dating from 2000, states that some of their lenses are made with 7 or 9 blade diaphragms which, when closed down 1.5 stops, produce a circular aperture to improve bokeh.
It seems that this may be a way that someone could determine how a lens will do in this regard.
Also, Minolta in a brochure dating from 2000, states that some of their lenses are made with 7 or 9 blade diaphragms which, when closed down 1.5 stops, produce a circular aperture to improve bokeh.
It seems that this may be a way that someone could determine how a lens will do in this regard.