Celestron dovetail

[parallaxerr]

Hi all,

I'm new here, been lurking for a few weeks so decided to join. I have a question about my (first) scope and mount.

I bought a Celestron Astromaster 90 EQMD about 3 months ago and have enjoyed viewing the moon on several occasions. I bought a digital camera adaptor and have managed to take some reasonable photos too First moon / CelestronImages.com - astrophotography with optics from Celestron Telescopes..

The problem I have though is balancing the scope with the camera fitted, basically I cant. The Astromaster 90 has a very short dovetail so I can't slide the scope far enough forward. I have made enquiries to several scope dealers now with no joy.

I have enquired about tube rings and a dovetail bar but nobody can suggest rings that will fit. I would prefer a longer dovetail fitted directly to the OTA but not sure if they are a standard size and don't really want to have to drill the OTA. Failing that the only solution I can think of is adding weight to the objective end but don't really fancy that idea.

Anyone had similar issues or have a solution?

Thanks, Jon.

[Cornelius Varley]

I think your mount uses the standard vixen type dovetail so a medium or long skywatcher dovetail will fit. Measure the outside diameter of the telescope tube to find the size of the tube rings you need, skywatcher probably have the right size.

Peter

[parallaxerr]

Thanks Cornelius,

You have confirmed what I thought to be the case. I've measured the OTA at 90mm exactly so a pair of 90mm Skywatcher rings and the long dovetail should do I reckon.