Christopher Nolan's "Interstellar" is in theaters now and available in six different formats including 35mm.

Despite the fact the format is almost dead, Nolan, along with directors like Quentin Tarantino, Paul Thomas Anderson, J.J. Abrams, and a few others, vow to keep the format alive by continuing to shoot on film the old-fashioned way.

Nolan's campaign to save the ailing format picked up steam when Paramount announced last month theaters equipped with 35mm and 70mm projectors will get the film two days early.

"We are taking a moment to acknowledge the huge heritage of film ... filmmakers like Chris and J.J. want to make sure that film is a part of the business going forward," Paramount Vice Chairman Rob Moore told The Hollywood Reporter.

35mm and 70mm film can look brighter and clearer than digital projection, though the latest IMAX and 4K digital projection technology comes close. Digital projection has caught on because it's cheaper to distribute, among other reasons.

In an interview with the Director's Guild of America magazine, Christopher Nolan himself outlined why he prefers film: