The scope was mounted on a Vixen Atlux mount. PHD autoguiding was used and the images were captured with an Atik 383L mono CCD camera and a set of Astronomik narrowband filters.
10 min sub-frames were captured with matching dark-frames and they were combined with flat-field frames to reduce the effect of vignetting in the final image.
The total exposure times were 60 min for each filter.
The Leo Triplet
Closer view
