...It's funny that when I used a community darkroom, I enjoyed a Nikon enlarging lens, so when I went on my own I selected one to buy brand new. It never met my expectations. But a Rodenstock Omegaron, which was a good bargain, proved to be my first usefully sharp 50mm enlarging lens.
I find reading this a little discouraging, since I don't have anything to compare w/ my el nikkor so I wouldn't know. Do you notice this using the lens as well as in the finished prints?
I think the idea of a fixed focal length box camera is great, and Umut I hope you enjoy using it on the bosphorus!