Can I ask what may be a dumb question - How critical is enlarger alignment. I am still new to darkroom and I am often swinging the lensboard around to correct verticals. I just line it back up with the centre marks - its a grips screw and slot arrangement. using a focus finder seems to show me that centralising gets the same focus across the baseboard quite easily. Is there not a depth of field on the enlarged image that gives some tolerance anyway? I am not getting this micro-adjustment or am I missing something.