Rosetta Nebula H-alpha version
Main optics: TS ED-APO 90/500 mm with QHY9M @-30°C
Filter: Astrodon H-alfa 6 nm, Filterwheel StarlightXpress
Guiding: Celestron 102/660 mm with Atik16ic, filter UHC
Mount: EQ-6 Pro with EQMOD
Stacking : DSS, white and black point correction, small noise reduction.

exposures. 36x900 seconds

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