adapting diopter correction lens - Leica M-A / M7 / MP and Film M - Leica Forum
LEICA DIOPTER / CORRECTION LENS 14352 +1.5 FOR LEICA M CAMERA -MADE IN GERMANY. | eBay
The ultimate guide to vision issues, glasses, contact lenses, viewfinder magnification, and diopters for Leica and other rangefinder photographers – Leica Lenses for Normal People