Thanks, guys

- The lens mount is the same - just unscrew one and screw the other. They have almost the same flange to neg distance.
That was one of the reasons I've purchased the Nikkor and not a Componon that was in Ebay at the same time, the Componon needed a shorter distance that the enlarger would not allow (and the Nikkor ended cheaper .

- It may quite well be the condensers. There's no way out of it, since as I've posted, the condenser assembly does not have any adjustment. But I can try the diffuser (there's one and I'm not using it)

Jorge O