u/MrNotAccurate

Caldwell 4 | The Iris Nebula

Captured over two nights from a super dark Bortle 1/2 in central Idaho. Had about one and a half nights of clear skies and was able to get 7 hours of total integration (850x30s). Data captured using Seestar S50.

Processed in Pixinsight:
BlurXTerminator
NoiseXTerminator
Generalized Hyperbolic Stretch
StarXTerminator
Contrast/color adjustments on just the nebulous region
Add stars back, very slight contrast adjustment with stars
Another round of NoiseXTerminator