Quote Originally Posted by phfitz View Post
the Delta 1 Bes-Align assumes the rear mounting flange is exactly aligned with the lens axis, the Versalab Parallel assumes the front flange is exactly aligned. Maybe, maybe not. It is still best to check on the easel with a micro-sight and test negative.
I am not sure what the "mounting flange" is. Are you talking about something on the lens board (or Bes Align) or the actual housing of the lens itself?

I have to say enlarger alignment is one of the areas in photography that fills me with the most doubt. Any light that can be shed on that topic is much appreciated.