Lens mounting ring question

[Cesare Berti]

I bought an old 480 Apo Ronar in a compound shutter. Lens looks good, shutter sounds fine but no mounting ring. I roughly measure the OD of the thread to be three inches or about 75 mm. Does anyone know the actual size of ring need to buy? Thanks.

[Toyon]

Check the SKGrimes site. They supply new rings and flanges for many new and obsolete shutters. Lensn2shutter.com also gives mounting dimensions for shutters.

[Ole Tjugen]

The thread specifications for Compound shutters are in my signature. :)