I just got the schneider kreuznech componon-s 80/4 enlarger lens (from keh) for 6x6 stuff, and it's the coolest enlarger lens I've ever used. I'm inclined to use it for all my 35mm and 6x6 stuff now. It's on my Chromega-B enlarger.
Two things make it cool. First, the aperture setting has backlight illumination. I've seen other lenses before with a lucite rod to illuminate the white lettering externally, but nothing beats the backlight. Second, it has a lever you can push to go wide open or back to the selected F stop setting. Great for recomposing or focusing between similar negatives. A worthwhile timesaver. (Sorta like the lever on a 35mm SLR lens built into the mount where you focus and compose wide open, and the camera moves the lever to stop it down for the photo)
Previously, I've sworn by El-nikkors because they have nice clicks and big friendly numbers on them. They are still good, but not quite as nice to use as this schneider with backlighting and aperture lever.
I am now looking for a similar lens in 135mm size for doing 4x5 printing with by beseler cb7. Quick research shows the other schneiders may have the backlit aperature readout, but are missing the stopdown/wideopen lever. Are there any other lenses for 135 range (widest of 4x5 choices) that have these two features?