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I have a very similar setup with an AP130GT and TCC.
I got several of the AP 1mm spacer rings.
I found the stated spacing on the AP website to be considerably off
on my QHY600m. I can measure mine if you like.
Recommended was something like 102.4mm.
My best results were at something like 119mm!
I tried it twice.
I get mostly good stars in the corners.
These small pixelled cameras are known by AP to cause issues that the 9micron CCDs did not.
Greg
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