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But i find the fact that the triangle only stack when the secondary is in that position

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Jimmy, as I mentioned in an earlier post, the autocollimator has nothing to do with the secondary mirror alignment under the focuser. That is, you will be able to stack all reflections of the autocollimator perfectly for different secondary mirror alignments. I pulled out the following animations from the thread I referred to in an earlier post. Every frame represents a good axial alignment yet each frame includes a different secondary mirror alignment.
Jason







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XT10 classic with premium optics
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