Hello, Usually I use Minolta Rokkor -X 80mm/f4 or Apo-Rodagon N 90mm f/4 to print 6x4.5 negatives with very good results. Enlarger - Rolei 6x7XL (Omega 670XLS). Recently I got a new camera that makes 6x6 negatives (Rollei FW). Last night I printed some of my first shots. Unexpectedly I got prints with very light corners (all 4 corners). The problem is not in the camera. I scanned the negatives and the scans were fine. Could it be the lens or enlarger? I thought that 90mm lens should be adequate for 6x6 negs. Do you think that 105 or 135mm lenses will do a better job? Thank you.