Quote Originally Posted by tenniss_balls View Post
The lens is a Goerz 12" dagor it's barrel mounted and I have the sinar copal shutter. . .
I will not tolerate focus shift. If I suspect that a lens has focus shift, it's going to get SOLD! And, longer Dagors are known to demonstrate this aberration. Life is complicated enough as it is; I will not add focus shift to that mix.

There are too many other options in a 12" lens; go for one of those. For example, I recently purchased a Fuji, 300mm f5.6 with inside lettering for 8x10. This lens has excellent coverage, and I'm not worried about focus shift with this lens. It's single-coated; but, I decided to stick with single-coated lenses for 8x10. (It's less expensive.) One nice thing about this lens, it takes 77mm filters, versus something larger.

I'm also seeing some decent DBM options on EBay.