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I think you’ll need to use shims or washers under the corners of the base to adjust tilt. I used to have one of these and it was a nicely made focuser but pretty basic with no tilt adjustment IIRC.

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Are you sure the tilt is due to the focuser mounting and not drawtube sag?

If you have lots of drawtube travel available, you could put a tilt ring into your imaging train. I use one specifically for the 100mm thread of my RC's extension tubes, but others are available. The Gerd Neuman ones are super-nice, and can be adjusted without disturbing the train.

Edited by rickwayne
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On 16/02/2023 at 17:43, Stu Wilson said:

remove the tilt?


The GSO dual speed is usually very good, unless you're nearing the limit of what it can hold. Depending upon how far out from the tube you are focusing, maybe around 800g. 

It would be easier to help if we could see the tilt. Single frames are best for this. Collimate then take frames:

-before and after re-seating the camera in the focuser.

- tension screw tighter and looser

- more or less torque on the locking screw.

- before and after a meridian flip

- before and immediately after rotating the camera 90°


- How is the mirror held to its cell?

- What method of guiding?

- How is the tube supported? (dovetails, top rails...)

- optical train detail

That should get us started.



Edited by alacant
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