Leica Guide: Zeiss ZM 25/2.8 Biogon + 35/2 Biogon Examples
Published in Guide to Leica are examples with the Zeiss ZM 25mm f/2.8 Biogon and examples with Zeiss ZM 35mm *f/2 Biogon. These are the same examples found in my Sony NEX-7 review, an approach I previously indicated.
I have also added a general discussion of color shading.