is that iso 1600? how long was the exposure for?
Try adjusting ISO settings and keeping exposure time the same, to see if the graininess adjusts. that is a good 'first t try' photo!
heres one of my first attemptss at orions belt/nebula.
ISO 1600, 300mm Lens and f5.6 for a 10 second exposure on tripod. bit of movement but u can clearly make out the nebula! specially the red color!
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