I have a 10" square lensboard on my 11x14 Century 8A studio camera and think it can handle any lens I can afford. The Dallmeyer flanges top out at an ID of ~ 7", so if you find that 8D at a yard sale--you'd still be ok with a 10" square board. In the extremely unlikely event you can find a 30" f/3.8 petzval, it would still fit on a 12" lensboard. You've gotta ask yourself a question: "Do I feel lucky?" Well, do ya, punk?