Quick, interesting animation:
In a recent experiment, Prague-based photographer Dan Vojtech decided to try out different focal lengths on the same portrait photo of himself and log the effects it had on it. The difference between 20mm and 200mm are unbelievable. So next time someone says that the camera adds 10 pounds, they’re not entirely wrong – it all depends on the equipment used.
Interestingly, a couple of years back some Adobe & Google researchers unveiled work on “Perspective-Aware Manipulation of Portrait Photos”:
[YouTube] [Via Peyman Milanfar]