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Dad Photographer
I have used Canon FD lenses with the Adapter B on Leica camera bodies. When adding another adapter (Leica Screwmount to M mount), I can use the lenses also on M mount Leica cameras or the Bessa T, say. I have used the Canon 7.5mm fisheye lens and also the Canon 17mm/4 lens. As mentioned above, with such wide angle lenses, there is no need for rangefinder coupling. The main advantage I can see here is the possibility to use wide angle lenses that I don't have in Leica mount.