Question for the optical gurus.
Many modern lenses intended for large format work are threaded to screw directly into Copal #0, #1, #3 or #3S shutters and quite a number of people are using the same shutter for two or more lenses, without any consideration to spacing between the elements. And this seems to work reasonably well in practice. My question is, why does it work so well? Is it because most lenses made for a given shutter size also have identical or similar spacing between the elements, or is it because most lens designs work well enough in spite of varying spacing distances between the elements?