Martin Dake , Jul 13, 2010; 09:49 p.m.
An 80mm lens will cover 6x6 just fine and most will also do 6x7 although a 90mm is the standard for 6x7.
I use a Nikon 80mm and it covers my 6x7 negs.
Do you have the condensor or dichroic color head?
Send me your email address and I will send you a copy of the manual; click on my name and I think you can send me an email from there.