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Celestron Radial Guider and T-Ring fitting


Jammy

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I've bought a second hand Celestron Radial Guider OAG.  It looks quite old, but is in good condition.

I intend to use it with my C9.25, f6.7 focal reducer and Canon 600D dslr.

I have a standard Celestron T-Adapter-SC #93633-A and Canon AF T-Ring.  These fit together nicely and all is well.

I just tried fitting the T-Ring to the Radial Guider OAG but they don't fit together.  The thread appears different on the OAG to the standard T-adapter.

I was wondering if anybody knew what I need to marry the two parts together?  Or do I need to buy a different T-ring?

Any help would be appreciated  :smiley:

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I think I've worked this out.  One of them has a T/T2 thread and the other has an M42 thread.  I'm just not sure how I'm going to tell the difference between a 0.75mm and 1.00mm pitch thread!

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