ann clancy , May 12, 2004; 09:45 a.m.
Is the school using the same light head? We have the 400 and the bellows remain in what would be the 4 x 5 stage. The 400 also has mixing chambers that must be changed out, perhaps the 500 does the same with a change in negative size and lens size.
With a condensor head the negative stage bellows must be moved for proper coverage of specific negatives. With cold light, diffusion heads and color heads the negative stage is placed at the 4 x5 postion. Try closing the bellows down all the way , check the mixing chambers. If you are getting even illumination with the bellows at 1 inch continue to use that setting.