Mohamed replied to the topic 'M 1 - Crab nebula' in the forum. 3 years ago

knro wrote: Thanks for submitting it, your images are getting improved, but there is still room to improve.

The star do not look right in the image. It appears they have some coma? Maybe the scope requires collimation? maybe field not flat enough issue? I'm not really good at this but something is definitely off.


Thank you Jasem. I agree, there are a lot needed to be corrected. The stars looks bigger than I expect, and with close attention to the very small ones in the periphery, it looks like a trail in one direction. I'm setting major portion of today's session for alignment checking (PS: I don't have access to Polaris so I do polar alignment using other techniques). I checked the collimation yesterday and it looks ok.

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