AVENON M-COUPLER FOR LEICA 28-90 AVENON Leica L-M ring NO.20524 Bright frame 28mm, 90mm Leica mount adapter L mount-M mount. This is a mount adapter that converts L mount (screw mount) to M mount. The bright frame supports 28mm and 90mm frames. Please consider this as a practical item. Please refrain from purchasing if you are sensitive to condition. Body only.