IN THEORY: Photo merging. Do as the astrophotography people do, take multiple exposures on tripod, plus some "darks" (lens cap on), convert to tif, shove your photos into a planetary imaging program (which might collapse due to size of files, depending on the program), merge, output, do final finishing in your favorite general editor (Ps or other). I have not tried this with the DP2M files because I don't do big-stopper-at-dawn shots. I am a beginner at astrolandscape and wide-field astrophotography, and I am learning with Canon 60D and 6D files at ISO 1600 and 3200. Canon DSLRs are the default DSLRs in astrophotography, it is somewhat easier to work with "known quantities". By the way, if you want monochrome output, push that DPxM ISO up to 1600 and work the blue channel.