Leica 28mm f/2 Summicron-M ASPH vs 28mm f/2.8 Elmarit-M ASPH on Sony A7R (Pescadero Creek)
In Guide to Leica is published an in-depth analysis of the Leica 28mm f/2 Summicron-M ASPH vs 28mm f/2.8 Elmarit-M ASPH on the Sony A7R. See prior general discussion of M lenses on the A7R.
This carefully chosen scene/example inserts a corrected image into the entire-frame aperture series and crops aperture series to show precise behavior, and gives specific guidance on aperture.