Avengers: Endgame is one of the biggest moviegoing events of the year, so it stands to reason plenty will want to see it on the biggest movie screen possible. While plenty of blockbusters are “reformatted” to fit an IMAX screen—which basically means just extending the frame and tweaking the sound—Avengers: Endgame was actually shot entirely with IMAX cameras, so when you go see it on in an IMAX theater, you’ll be seeing the film the way it was intended to be experienced. A new behind-the-scenes featurette finds Endgame directors Joe and Anthony Russo discussing why …