PHD autoguiding was used with an Atik 383L mono CCD camera and a set of Astronomik filters.
10 min sub-frames were captured with matching dark-frames. Flat-fields were used to reduce the effect of vignetting in the final image.
The total exposure times were 20 min using a SII filter, 20 min using an OIII filter and 90 min using a H-alpha filter.
M97 and M108
Closer view
