 Eric <unk> served as director of photography ; he joined the team during a shift in focus in January 2008 . <unk> used a <unk> AG @-@ <unk> <unk> HD <unk> . He commented to industry publication <unk> about the choice of technique , that due to the intensity of the production team 's travel schedule tape format would not have been an option . He stated he preferred using <unk> cards over the <unk> @-@ based format due to its superior reliability . During the editing process , Glen Echo Entertainment utilized eight Apple Macintosh computers with Intel processors , equipped with Apple 's Final Cut Pro editing software . 
