M13 - 56 x 3min subs

M13. I stretched the original Tif using DSS. Hardware details: Camera: Nikon D200. Telescope: SW Evostar 120 with Baader UHC-S filter. Mount: AZ-EQ6 guided using a ST80 synguider. Image details: Lights: 55 x 3min at ISO 800, Darks: 20 x 3min at ISO 800, Lights and darks separated by 1 min intervals. Flats: 40 x 1/40s at ISO 800, Bias: 30 x 1/8000 at ISO 100

Date of capture 13/03/2016. Conditions: Clear sky. Seeing was good. The guiding was good, most frames were usable.  The wind was moderate but not affecting the scope much.

Processing was done in DSS. I increased the saturation by 25% and aligned the colour channel histograms until the dark signal at the edge of the image (the darks were not quite cancelling the dark signal) was the same as in the original photos. The extra light subs have noticeably improved the sampling for the green channel.