You need a recessed board to get the biggest enlargements possible with the 50mm lens. I use both 80mm and 50mm lenses and have the commensurate condensers, and the right boards (non-recessed rfor the 80mm). If you have the wrong condenser (e.g. 50mm condenser in with the 80mm lens) then you get light fall off. You can print 35mm with the 80mm set up (all be it smaller enlargements), but you can't print 6x6 with the 50mm set up. I also thought the 605 can project on the wall....? The condensers are hard to get hoild of on their own.K