Test reviewers of the lens correctly point out that the lens suffers from coma that gets snuffed out by f/4. Keep in mind that the 40/2 Summicron-C for the Leica CL (film version) with a typical symmetrical 6/4 optical configuration also suffered from coma requiring f/5.6 to snuff it out at the far edge zone according to Popular Photography's lens test report. Zones 1/3 and 2/3 out required a little less stopping down to bring coma under control. To bring these types of aberrations under better control, I'd expect much more glass would be required las in the 35/1.8 S version.
Apr 20, 2022 at 01:12 PM
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