Okay, I see your points about groups and such. I am only talking about removing the front half of the lens from the barrel and the rear half from the barrel(not taking those apart any furthur). I put these into the Copal #3 shutter (direct fit) with out spacers and the image looks good on the ground glass, but I have not made any exposures yet. Probably for contact printing I will never notice any difference regardless of whether I use the spacers or not. But I may at some point want to use this lens for 4x5 color, so I was thinking that if this lens can be optomized for infinity work then I should try to do that.??.