Rosette Nebula

Caldwell 49

 

Using a basic astro setup. No triplets, CCDs, or heavy mounts here, just a trusty 80ED doublet and a DSLR.

 

Orion ED80 with x0.85 reducer and GSO focuser

Advanced VX mount

Nikon D5300 h-alpha modded

ST80 with QHY5L-II for phd guiding

Sharpcap polar alignment

 

12 dithered subs @ 200 iso x 480s = 1h 36min total

30 bias

30 flats

 

Bortle 2 skies at Nirvana (Irvine Lake Airstrip near Bon Echo Provincial Park, ON)

Image scale is at 1.58px

Guiding RMS was horrible - around 1.2 for DEC and 1.6 for RA

 

Transparency average

Seeing average

 

Imaged using BackyardNikon, Stacked in DSS, processing in Pixinsight.

 

Dynamic crop (just edges)

DBE

Background Neutralization

Color Calibration

SCNR Green

Luminence mask

MLT noise reduction on background

Histrogram transformation

Mask with stars mask subtracted for:

- LocalHistogramEq

Histogram adjustment

MLT Chrominance

Color saturation adjustment

Curves adjustment

Morphological transformation for star reduction

Dark structure enhance

Done