FS60C lens cell thread size? Help!!

Hello all,

I'm trying to determine the thread size on the FS60C lens cell, in order to get a holder machined for an energy rejection filter. (This is the thread that the dew shield screws onto).

I *think* it might be M77 x 1.0.

Any advances on that?

Thanks - Jess.

Yes, that thread size is M77 x 1mm.