Canon Macro Lens connected to Leica M-Mount body with an adaptor. Since f-stop is controlled on the body rather than on the lens, the aperture does not appear to be adjustable and judging from lack of DOF, is probably wide open (f/3.5 rather than f/1.0 as shown in the EXIF)--even so this is an interesting experiment as it demonstrates how a Canon lens can be used--even if only at a single or fixed aperture--on a Leica. If the lens had an aperture ring to adjust the f-stop, then the complete range of the len's f-stops would likely be available.

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