An 80mm, f/6.3 refractor was used on a Vixen Atlux mount, with PHD autoguiding, an Atik 383L mono CCD camera and a set of Astronomik filters.
Ten-minute sub-frames were captured with matching dark-frames and flat-fields were used to reduce the effect of vignetting in the final image.
The total exposure times were 30min using an OIII filter, 30min using an SII filter and 90min using a H-alpha filter, plus 3 hours using a blue filter.
Markarian's Chain
Closer view
