Tulip nebula area in Cygnus, ThierryD

Tulip nebula area in Cygnus

Tulip nebula area in Cygnus, ThierryD

Tulip nebula area in Cygnus

Equipment

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Acquisition details

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Description

This time I imaged at ISO200.
I was surprised to see that after stacking there was much less noise than at ISO100.
I suppose it has to do with quantization noise.
Transparency was excellent too with very little light diffusion so in the end I didn't have to apply noise reduction at all.
Since my last image I opened my camera and reduced  backfocus a little bit by tightening the screws around the sensor.
Stars look better now in the corners (less color fringing) but not perfect either.

Comments

Histogram

Tulip nebula area in Cygnus, ThierryD