M57 crop

Date 01/09/2017. Crop of M57, the Ring Nebula. Mansonville, southern France.

Weather: Clear skies and good seeing. The guide scope stayed on target the entire night.

Optics and camera: Skywatcher Evostar 120 F/D=8.33 (Achromat) with a Baader UHCs filter. The camera was a IR-filter removed Canon 600D.

Settings: 52 x 3 minute lights, 50 darks from library, 50 flats taken recently and 50 bias frames. ISO 800.

Mount: Skywatcher AZ-EQ6 with extension pillar.

Processing: The Lights and calibrations frames were processed using Pixinsight (my first attempt at using it). The final images were balanced to retain average white stars. I also used Gimp to add a selective Gaussian blur over a 5 pixel range to blend residual RGB noise.