What kind of thread on the OAG?

[vladutz]

Hello

Can anybody tell me what size is the thread of thr OAG on the telescope side, with the nose piece removed ( so directly in the OAG body)? Is it M54 or M51? Also is the thread size 0.75mm ? ( Standard for most optical threads)

Thanx
Vlad

[joelshort]

It's M54, and I "think" that the pitch is .75