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Hi Leo,
I have the same camera and recently purchased a M42-mount TT Artisan 100mm F/2.8 full frame lens. The back focus distance will depend on your lens mount type: I had to add a 25mm M42 spacer to get it to focus properly to infinity.
It was easy enough to get a ball-park spacer distance by mounting lens to camera without any spacer. While viewing the camera output using capture software, disconnect the lens and, holding it in your hand, slowly move it away from the sensor until you achieve focus.
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