I print with a 35mm LPL enlarger, with two different, 2-blade LPL easels. I adjust the blades to set the borders, but I noticed that with a standard 50mm lens, I can't quite get 100% of the frame onto the paper. No problem, I just print what I can. This happens with small paper and up to 8x10.
The other day however, I was fooling around and screwed a 35mm lens into my enlarger, and lo-and-behold, I was able to get everything in. Have I been doing things wrong all this time? What stupid mistake have I made this time??