Filming

Principal photography began on April 25, 2011, in Albuquerque, New Mexico. In June, stuntman Jeremy Fitzgerald injured his head while attempting a stunt involving a 30-foot fall from a building after getting hit by an arrow. A Marvel spokesperson later told TMZ.com that despite the injury, Fitzgerald recovered and continued working on set.Production relocated to Cleveland, Ohio in August 2011, where filming transpired over a period of four weeks. The city's East 9th Street was chosen as a double for New York City's 42nd Street to be used in climactic battle scenes. Army Reserve soldiers assigned to the Columbus, Ohio-based 391st Military Police Battalion provided background action during the battle scenes in Cleveland. Staff Sergeant Michael T. Landis stated the use of real soldiers made the scenes more realistic and helped portray the military in a more positive light.
 Filming also took place in the large vacuum chamber at the NASA Plum Brook Station near Sandusky, Ohio. The station's Space Power Facility was used to portray a S.H.I.E.L.D. research facility. A series of explosions were filmed at the Chevrolet powertrain plant in Parma, Ohioas part of the battle sequence that began in Cleveland. Scenes from the film were also shot on Public Square and the Detroit–Superior Bridge. Public Square's southwest quadrant was turned into Stuttgart, Germany, for filming.

Principal photography concluded in New York City, where filming occurred over two days. Filming locations in New York City included Park Avenue andCentral Park. For scenes taking place in Manhattan, visual effects supervisor Jake Morrison shot aerial footage for over three days to use as background plates, elaborating that his main objective was to "get as much aerial work in as possible for the audience to see the big expanses, the wide establishing shots, while also making sure that the effects work doesn't look too computer generated". "We're getting much better at making entirely computer-generated environments," Morrison explained, "but there is no substitute for starting with a real image and adding what you need."

Cinematographer Seamus McGarvey stated that he composed the frame with an 1.85:1 aspect ratio to cope with the varying heights of the main characters, explaining that "shooting 1.85:1 is kind of unusual for an epic film like this, but we needed the height in the screen to be able to frame in all the characters like Hulk, Captain America and Black Widow, who is much smaller. We had to give them all precedence and width within the frame. Also, Joss [Whedon] knew the final battle sequence was going to be this extravaganza in Manhattan, so the height and vertical scale of the buildings was going to be really important." The film was McGarvey's first venture shooting with a digital camera, the Arri Alexa. The Canon EOS 5D Mark II and Canon EOS 7D digital SLR cameras were used for some shots, and high-speed shots were captured on 35 mm film with the Arriflex 435. About his visual approach, McGarvey remarked, "Joss and I were keen on having a very visceral and naturalistic quality to the image. We wanted this to feel immersive and did not want a 'comic book look' that might distance an audience with the engagement of the film. We moved the camera a lot on Steadicam, cranes and on dollies to create kinetic images; and we chose angles that were dramatic, like low angles for heroic imagery."