M105. NGC3389. This group of galaxies lies in the northern part of the constellation of Leo. I was using my 4 inch f/6.3 refractor, a Vixen Atlux mount, PHD auto guiding and an Atik 383L mono CCD camera. I used an Idas filter for the luminance data and RGB filter for the colour data. I captured five minute sub frames with matching dark frames and combined them with flat field frames and bias frames to reduce the effect of noize and vignetting in the final image. The total exposure time was 60 minutes using the Idas filter and ten minutes for each RGB filter.
