Leica Tri-Elmar-M 16-18-21mm f/4 ASPH., black anodized Image Leica Tri-Elmar-M 16-18-21 f/4 ASPH. The super wide-angle lens with three focal lengths Material number 11626 Find a store Shop now Technical Data Files Tri-Elmar-M 16-18-21 mm f/4 ASPH. - Technical data English Format pdf (352.33 KB) Download Understanding Leica Lenses Terms and abbreviations related to Leica Lenses simply explained. Leica Stories Exceptional images are never a matter of chance. Let our Leica stories inspire you.