M92 Drizzle 2x (24/03/2017)
Date 24/03/2017. The Globular cluster (M92) was my final target of the night. This image uses the same data as the previous stack of M92, except I only processed the central portion and enabled 2x drizzle. I also tweaked the colour balance to really show the different star colours.
Weather: The sky was clouding up near the end of the night. Seeing was good. Wind was still strong (9-12mph) and I lost quite a few frames because of vibrations. Temperature was about 3-5 degrees.
Optics and camera: Skywatcher Evostar 120 F/D=8.33 (Achromat) with a Baader UHCs filter (for removing light pollution). The camera was a IR-filter removed Canon 600D.
Settings: 64 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 Deep Sky Stacker. I set the star detection thresholds to values that caught about 30-40 stars. The final images were stretched in RGB and I then balanced the histograms to retain white balance. Luminance was tweaked to show faint detail. 2X drizzle was enabled. I also used Gimp to add a selective Gaussian blur over a 5 pixel range to blend the RGB noise.
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