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Thanks for that info Glen - I presume that you are using your Dob visually - in the beginning I checked the R/C with an eyepiece and I did not see the triangular stars only what looked like a slight trace of coma and that did not concern me unduly as I knew that the telescope needed further adjustment to reach collimation. It wasn't till I put the camera in that I discovered the problem of triangular stars.
I removed the silicon earlier this morning - further star tests will tell if my guess was correct or not.
Cheers
Geof wingham
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