We caught up with Affleck on the red carpet along with his co-stars Bryan Cranston and John Goodman, to discuss the film's shoot, its portrayal of the CIA and Affleck's influences as a director.
"I was consciously aping the look and the feel, even down to the contrast and saturation, of 1970s movies," Affleck explained. "In particular stylistically, movies like All The President's Men and Three Days of the Condor.
"They're perfect examples of what I thought… if I put that into the movie and made it feel like that, I thought the audience might subconsciously believe more that they were watching a '70s movie."
Argo tells the true story of an unconventional CIA mission in the 1970s, designed to free six US embassy workers who became trapped in Iran during the Iranian Revolution.
Copyright: PA Images Ian West/PA WireThe film is divided between Iran, Hollywood and the CIA headquarters in Virginia, and Cranston described his chagrin at being unable to accompany his fellow cast members to the more exotic locations.
"They shot in Turkey, and they were saying it was so wonderful, every morning at 5.30 they heard the call to prayer. It's like 'wow, how exotic, how romantic!'
"And we worked in the basement of an abandoned building in Los Angeles. The only call we heard was the call to lunch."
Affleck will receive a prize at this year's Hollywood Awards.
Argo plays at the BFI London Film Festival this Saturday (October 20), before its nationwide release on November 7.
Watch a trailer below: