I don't want to labour the point over the adapters for the S1's L mount but here is a list of those that have been available for a few years now from Kipon. https://www.google.com/amp/s/leicarumors.com/2017/03/12/kipon-adapters-for-leica-m-and-sl-mounts.aspx/amp/ Since that list was made they have also added the Canon FD adapter to it as well. Novoflex do a smart EF adapter with AF control as well. So the only lens type where there ISN'T an adapter available for it is the E m