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Hi Ken,
No, I understand that the Dec doesn’t affect the cone angle. The deck is only used to bring the alignment star back onto the (effective ra) line, as there is a little slop in the dec plane.
So, no, with the scope at TDC, I get the star in centre of view, but as I rotate the mount either side, the star appears to move higher in the screen. - suggesting the OTA is physically pointing toward the centre of rotation, since I am viewing without a diagonal in the optic train.
What I am seeing is like a an elliptical trace, flattened toward TDC, and elongated at either side. I see the same through the finder scope also.
Cheers Brian
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