enlarger vignetting / light fall-off
I'm using an LPL 7700 with condenser head and Rodagon 105/5.6 (old Zebra version) to print 6x7. I made a bunch of 8x10s last night and am finding that the prints are distinctly paler in the corners. I was running the lens at f/11 to f/16 so didn't expect vignetting at all, particularly at this low magnification (lots of bellows extension).
Is this a known issue with this lens or is it perhaps an issue with evenness of negative illumination from the head? I can burn the corners down a bit, but would prefer to get a uniform print straight off if possible.
Any suggestions/reasoning appreciated...