Galaxies M81, M82. I took this image under hazy sky conditions with stars only visible down to magnitude 4.3. I was using my 4 inch f/6.3 refractor, a Vixen Atlux mount, PHD autoguiding and an Atik 383L mono CCD camera. I captured five-minute sub frames with matching dark frames and combined them with flat field frames to reduce the effect of vignetting in the final image. The total exposure time was 90 minutes using an IDAS filter, ten minutes using a H-alpha filter and ten minutes using an O111 filter.
M81 and M82
