Update: McGarvey says he was misquoted by the interviewer - "I was talking about how up and coming film makers have access to a whole range of new technologies which expand our options as filmmakers. I mentioned that the iPhone and the Canon 5d Mk2 were devices currently used on many Hollywood productions. I used the Canon on some shots on Marvel's The Avengers movie. Unfortunately, this was edited to read that I shot some of the film with the iPhone. This is not true". The studio also confirms that "nothing in the film was shot on an iPhone".
Original: "The Avengers" director of photography Seamus McGarvey has made the surprising admission that Joss Whedon's upcoming superhero team-up project used some unconventional shooting techniques.
Specifically several shots of the big-budget tentpole were done with the iPhone 4, in fact some them actually made it into the recent teaser trailer.
"The beauty of photography or cinema is that you make every choice based on the content at hand. On The Avengers, I did a couple of shots on the iPhone and they are in the movie. In fact, they are in the trailer! I understand that sometimes there is no choice and you have to go for the cheapest option, but if you are limited for choice, you can still make poignant decisions that will effect the look of the film" McGarvey told IFTN.
Sadly the cinematographer didn't says which shots were specifically crafted using the smart phone, but the quality of the footage in the trailer itself never demonstrated any visible shift in quality.