For less than $400, you can turn your old Leica M6 into a DSLR style camera.

You’re probably wondering why you’d want to convert your Leica into a DSLR. After all, they’re meant to be small in the first place. But DSLRs can have advantages over rangefinders. One prominent example is with graduated ND filters. Of course, Leica has its own high-resolution Visoflex EVF with its newer digital cameras, but it doesn’t also accommodate SLR lenses.
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https://www.thephoblographer.com/2020/10/09/turn-your-leica-m-into-a-dslr-because-covid-has-you-bored/