Quote Originally Posted by okto View Post
Why do you need your enlarger aligned this precisely? A bubble level will get you within less than a degree; unless you're printing wide-open (and why would you?), that slight a mis-alignment should be covered by depth of field, no?

You are right IF you are talking about alignment between lens/film stage and the baseboard. Any mis-alignment will be covered by DOF. But, between film and lens stage alignment is very critical. Carpenter type levels aren't nearly sensitive enough for this purpose. I tried it....