Leica Guide: 16-18-21mm f/4 Tri-Elmar-M ASPH Comparison f/4 - f/11
Just published in my Guide to Leica is a evaluation of the Leica 16-18-21mm f/4 Tri-Elmar-M ASPH at its 3 settings of 16mm, 18mm, 21mm at f/4, f/5.6, f/8, f/11.
Anyone interested in the Leica 16-18-21mm f/4 Tri-Elmar-M ASPH should find this comparison quite helpful. See also the Alpine Creek comparison.