Some vintage tessar or triplet type lenses (eg such intended for viewfinder cameras) implement focusing by merely moving the front element or front cell.
When adapting such lenses to other cameras, is there an image quality difference between:
- unit focusing the lens with the front cell set to the infinity mark
- unit focusing the lens with the front cell set any other way
- actually aligning the flange distance so the front cell focusing can be correctly used
- mixing and matching as is convenient