UFO light ship with power up cruising over our camp out.Over the course of this multi day event I saw in excess of 40 UFOs and I was only doing serious night time photography on Sunday evening. During the previous evening we saw over 35 UFOs but I was otherwise occupied with a new romantic interest to care much about grabbing my camera. Although, on Sunday evening after she had departed I was shooting with a Sony A-65 with a standard 18-55 mm lens using a tripod doing 10 second exposures with 24 mega-pixel resolution in "night mode." I had just captured a photo of our crew singing around an open field when we saw a UFO suddenly appear in the sky. I was easily able to swivel my camera about 90 degrees, elevate the camera and snap a photo of the UFO. The UFO began traveling towards us over the field and did what's referred as a "power up" wherein the brightness increases of the UFO. It's hard to tell the altitude of the UFO but I would estimate that it was at least a mile overhead. The UFO then phased out and vanished. This is similar behavior that the majority of the other UFOs exhibited over that weekend. Many times the UFOs changed direction, sped up and slowed down, zig-zaged and phased in and out of visibility. Most where white in color and round in shape. Often there would be a couple of UFO appearing at the same time but most where single occurrences. I did not see any metal or hear any sounds associated with the UFO craft.The moon was almost full that night and was behind us. We had already seen the international space station fly overhead which was really bright and travelled linearly across the entire sky. I had also seen a few conventional aircraft fly overhead with their bright strobe lights clearly visible. I took a few photos of those aircraft as a reference. There were about ten other persons present in my immediate vicinity who all saw the same object and who all believed it to be a UFO. I will also clearly state that this gathering was alcohol and drug free.I am a professional videographer and I also have a fair amount of experience with digital still cameras. I have never filmed or photographed a UFO before but I've always had a big interest in airplanes and aviation history. I have worked for Boeing for a number of years and have seen and discussed many types of conventional aircraft. I was not able to associate these UFOs with any other craft that I have studied before. I have worked professionally with technology for 13 years and I have spent a lot of time studying the best way to capture light.