 Principal photography began on August 1, 2011, at an industrial park near DuPage Airport under the codename "Autumn Frost". Zack Snyder expressed reluctance to shooting the film in 3-D, due to the technical limitations of the format, and instead chose to shoot the film two-dimensionally and convert the film into 3-D in post production, for a 2-D, 3-D, and IMAX 3-D release. Snyder also chose to shoot the film on film instead of digitally, because he felt it would make the film, "a big movie experience". Filming was expected to last for two to three months. Production took place in Plano, Illinois on August 22 to 29. According to an interview with Michael Shannon, filming would continue until February 2012.
