Elephant's trunk @ 44 x 240s

Elephant's trunk @ 44 x 240s

 

Half moon - SQM 19.49

 

Skywatcher 200/1000

AZ EQ 5

ZWO ASI294MC Pro @ -20°C

Baader MPCC Mark III Coma Corrector

ZWO Filter Duo-Band: 44 x 240s

 

Autoguider with ZWO ASI120 MS-C

PPEC off

Dithering after each 2nd image

ZWO EAF automatic focuser (controlled by ATP)

 

Software:

 

EQMOD/ASCOM v2.00w

Stellarium 0.20.3

Astro Photography Tool (APT) 3.99

Platesolving: ASTAP 1.0.0RC5

Guiding: PHD2 2.6.10

 

Processing:

 

Ha/OIIII stacking with SiriL 1.0.3

Background exatraction on each image separately

Extracted Ha and OIII from OSC data

 

Processing with PixInsight:

 

* Cropping

* Histogram stretch and linear fit

* Star removal and star mask using Starnet 2

* Niose filtering on each image

* Combining Ha and OIII using Pixelmath with a Heaviside function (approximated by a tanh), softly replacing Ha with OIII where OIII exceeds a certain threshold compared to Ha, bossting Ha

* ASinh stretch on the RGB result

* Multiscale linear transform

* Pixelmath for combining Ha and OIII to color image for stars

* Blending the RGB nebula into the new image using the image mask from StarNet2

* Minor color adjustment with curves transformation seperately on stars and nebula

* Minor post-processing with Photoshop Astrotools

 

 

Done