I use the same lens and was going to query if you were stopping it down with the lever... but you seem to be on top of that... and you have verified the aperture blades are moving (although I'd suggest you take the lens out and visually look. Once stopped down to f22 the 'hole' should be pretty small. Maybe it's not actually stopping down correctly. Once all that checks out ok, check that globe!
Originally Posted by Simonh82
Just doing some mental arthmaatic... my enlarger requires 10-12sec @ f8 for a 8x10 from MF with minimal filtration, which at f4 would equate to 2-3secs... re-check that lens, or try one of the others?