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Old 16-02-2012, 11:06 PM's Avatar (Justin Tilbrook)
JHT is offline
Join Date: Jun 2007
Location: Penwortham
Posts: 3,039
Hi, James.

Thanks for the tips.
I rechecked the collimation, seems good.
Then decided to take an image without and with the coma corrector.

Eta1 shows an even coma right around the field.

Eta2 with the corrector shows reverse coma, and in one direction more than the other. It looks like it's overcorrecting?

Any thoughts?


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