Optical findings 35mm lenses The 3 lenses differentiate wide open in a close range whereas the Summaron 1958 shows a lower quality in vignetting, center and edge sharpness against the Summicron 2011. The Summilux 1987 is between but much closer to the Summicron. Of course the differences are fading when the lenses get stopped down. Visible is still a clear lower edge sharpness of the Summaron.