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Star shapes C11 EDGE HD + 0.7 FR + COAG + ASI071MC


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Hi,

I recently installed a C11 dew heater ring in front of the corrector plate. I did this with the telescope in the vertical position and don't think I've overtightened anything.  The issue I see now is that stars look egg-shaped, more on one side than the others. The image attached (not processed nicely but only to show the issue I'm facing) shows this (please zoom in to the corners). What can be causing this? Is this tracking, flex (I use COAG), collimation, corrector plate alignment? Thanks for watching. 

R. 

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