Blackmagic Design ATEM 1 M/E Constellation HDIntroducing ATEM Constellation HD, the world's most powerful HD live production switchers! These incredibly powerful HD switchers are available in 3 great models, including a 1 M E model with 10 inputs, a 2 M E model with 20 inputs, and a massive 4 M E model with 40 inputs! Plus each SDI input features a full standards converter! ATEM Constellation includes advanced features such as DVEs, ATEM advanced chroma keyers, media players, multiviews, and