I puchased a 210 Symmar S with a 4x5 at a vey good price. The lensis a perfect 12907678. It came in a Prontor shutter. Very limited. I have a 180 Symmar in a Synchro Compur. I found that the two main lens assemblies fit perfectly(210) into the Compur, but focus is very slightly off, as I assumed it would. Any ideas? Can I space the elements myself? Is there some one good, who at a reasonable price, could set this up for me? Appreciate any info. I'm in Santa Cruz, Ca. Thanks, Leagh.