M57 Ring Nebula

Date: 7 September 2013

Equipment: Skywatcher Explorer 150P, EQ3-2 with dual-axis motor drive, Canon EOS 1100D

Exposure: 110 X 45s @ ISO800, 34 dark frames, 30 bias frames ,18 flat frames

Processing: Raw files (cr2) stacked with Deep Sky Stacker Beta with hot pixel cleaning enabled, curves initially adjusted with Deep Sky Stacker, light pollution gradient removed and colours saturated with Fitswork

Location: London, England

This image has two problems.

The focus was slightly off. After this I began to use the Live View function at 10x magnification of the Canon 1100D to focus on the brightest star I could find.

Additionally, stars were smeared towards the edges of the image, convincing me to invest in a coma corrector, and also to think properly about how to collimate my Newtonian.