Adapting a 2" diagonal to a 1.5" fitting

[Atomic]

Greetings 'Oh fountain of all knowledge ':

I have just bought a S/H Orion Optics OMC140 (part A) which I believe (not actually seen it yet) has a 1.5" fitting on the back of the scope. The star diagonal I have is a 2" WO unit (part .

Any suggestions on how I should fit part A to part B preferably not using any form of adhesive or heat?

Thanks

Martyn

[GordonCopestake]

1.5"? Are you sure? It's highly likely to be a 1.25" or SCT thread. If it's an SCT thread you can get a 2" visual back for the OMC. If it's a 1.25" then you might be out of luck as without a custom adapter I know of no way of using 2" accessories with a 1.25" visual back. If it's 1.5" then Orion should supply their own adapter to use standard accessories.

[Atomic]

Thanks for the reply...

I have to admit that I have not yet seen the beast and actually meant 1.25 (typo) - sorry... The Orion site refers to 31.7mm which is nearly 1.25"...

In light of that, any suggesions?

regards

Martyn

[Milamber]

I think you will find it is a native SCT thread with an SCT to 1.25" adapter screwed on. As Gordon says - the SCT to 2" adapter is readily available.

Arthur

[Atomic]

Getting somewhere - thanks

See images

The OMC140 claims to be Meade/Celestron comaptible.

(click to enlarge)

All the adaptors that I have found (so far) are 2" push fit, bit the WO diagonal that I have seem to be a screw fit. It is claimed to be SCT - does this look right?

(click to enlarge)

Sorry for the dumb questions, but in the past all I have had to worry about is a newt and tbh, I've never looked closely at a MCT or SCT..

Regards

Martyn

[Rob]

Hi,

Its a standard SCT thread. You can use the diagonal as pictured above or buy a 2" visual back for a push fit 2" diagonal.

Rob

[Atomic]

Sorted ,

Thanks all - much appreciated..

Regards

Martyn