Having recently developed TLR madness, I started printing from 6x6 negs with a Nikkor 80 f5.6 on loan to me and I am getting great results. Problem, the owner (my brother) once moved into his new house and his darkroom set up is going to want his lens. back. I am on a Devere 504 with a Varicon Condenser head, I have one lens board for M-39 so I really don't want an endless quest for a second lens board so what are my options for a decent enlarging lens for 6x6 provided it's M-39. I would also like to know what is the ideal focal length for printing 6x6? I have seen online anywhere from 75 to 105mm is considered ok for enlarging 6x6. I looking for some clarification so I can narrow down my search.