I'll have to check my enlarger but 5x7 with no filters might just get you down into the low single digits. I feel your pain. I was surprised about how bright my enlarger was as well. Enlarger lenses can actually accept screw on filters. Depending on the configuration of your Beseler 23 C you may have an upper filter drawer where you can put a ND filter as well and leave the lower filter holder for contrast filters. I guess if you want to have a bulb that is bright enough to make large enlargements at reasonable times you have to accept that it will be ridiculously bright for smaller enlargements.
Originally Posted by viridari