Hole size for Nikkor 210 lens on a beseler 8x10 conversion head?

[bobbysandstrom]

I'm going to have a beseler lensboard (4"x4") machined for a nikkor 210. Does anyone know the size of the hole that needs to be cut?

Thanks

Bob

 

[resummerfield]

My 210/5.6 El Nikkor has M72 x 1.0 threads