Thank you for your answers. Telecaster, that is good news. Jim, it is still good news. I don't think my C/Y lenses have floating elements, and on my lenses, I replace the distance scale with a millimeter scale anyway (as an aid in focus stacking). Which also will make it easy for me to make my own infinity marks, if otherwise I can define "infinity". When focus stacking using live view and 10x enlargement, I have found out that I need to define the 'furthest point' (rather than 'infinity') by eye sight anyway.
Good news, and thanks again!