There are three available condensers for my enlarger (Durst M700) - Unicon 50, Unicon 85, and Unicon 105. I understand that the number part (50, 85, 105) corresponds to the diagonal length of the negative that can be printed with this condenser, so the 50 is for the 35mm, the 85 is for 6x6, and 105 is for 6x9. What are the drawbacks of using a larger condenser (say, the 105) for printing smaller negative sizes? Should the lens be chosen depending on the negative size, or on the condenser size? In other words, can I use the 105 condenser to print 6x6 negatives with an 80mm enlarging lens? Many thanks for any input!