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Hi Chrissyo, when you think about what you have done , mounting the camera on the scope then the whole scope/camera setup becomes one, so even though the camera is held still if the scope moves then you will see that movement in the camera,hench the term camera shake.
You say the scope stays put with the camera attached,it will only take 1mm of movement to affect the final image.
Try the shot again and try to support the top of the tube, use a chair or kitchen stool to begin with or anything that gets you to the right height.
If you have any sort of breeze or wind this will move the scope in small amounts so it will help with wind also.
another thing to consider you are shooting at high F ratio's maybe F20 or F30 or higher, to do astro at these ratio's the scope/camera must not make sudden movements such as a small breeze would give you.
The good thing about the way you are imaging is you can pick the best frames with registax and only stack them this will give you a better final result.
Keep at it Chrissyo, you have a good result with this shot and don't be afraid to try anything and everything to get a great shot.
cheers
david.
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