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Wiltraud, thanks Really very fast shipping, I'm surprising a bit ))
This is usual Chinese mounts, but modified for better working. And possible additional modification of inner slot for aperture lever, some lenses have wide angle of moving this lever and the aperture does not fully closed with standard mounts
Great sharpness with 1,4x! Btw, recently finished the first 1,4x modification for Nikon from front side.