Enlarger adjustment troubleshooting
I am in need of some advice once again. I am the lab tech for a darkroom in Philadelphia called Lightroom. We have three Omega pro-lab 4x5 enlargers. All three seem to be in terrible alignment based on some test prints I did on each. One of them I used a Beseler level adjustment to bring the negative stand into alignment with the base on which the easel sits. The image was still terrible out of focus in one corner while three others were pretty good. One of the other enlargers is still way out of focus on three edges after the negative stand alignment. How else can I troubleshoot this problem? Are the lenses the next likely culprit? They are all secure on their lensboard, and the bellows seem nice and tight. Not sure what else I should look for..
Thanks for any responses