Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888
NGC6888, Yannick D.
NGC6888
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NGC6888

NGC6888, Yannick D.
NGC6888
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NGC6888

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Description

Poor FWHM but still publishing it...

Stars are well round in the center of the pic and deformed in the angles, do you have any thoughts? Is it tilt, flexion with guiding scope, coma corrector issue...?

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NGC6888, Yannick D.