Quote Originally Posted by jnanian View Post
... they are all good performers if stopped down maybe 4-5 stops.

I've been using El Omegar lenses that came with the Omega enlarger kit that I'm currently selling. I've used both the 50mm and the 75mm, both stopped down to about f/11 or f/16. I've not noticed an issue, but then again my eye is still quite untrained.