Hello:
I have just seen your thread, so I hope my comment does not arrive too late. I have a Durst M805 (condenser), and these are the lens I work with: EL-NIKKOR 75mm 1:4 (for 6x6) and EL-NIKKOR 50mm 1:2.8 (for universal format). I wish that this information helps you.
Henry.
I don't have the info on the M805, but on the M800, the manual indicates it will focus with both 50mm and 80mm lenses on the flat LAPLA. The recessed SETOPLA is needed only for the 35mm and shorter lenses.