Cedric:

I had the 4x5 Field. The 110XL is a easy, and a 210 will focus, but you start to run out of rail as well as bellows... despite the fact that the rail is 30cm long, the effective length is less due to the design of the standards. A 180 is more reasonable. The 24cm conical synthetic bellows can easily handle the 110, 180 and a 300, but you will need a rail extension.

Glenn