Quote Originally Posted by nickrapak View Post
Most people agree that it shoots well enough at 1600, but there's disagreement as to whether or not to push the film in development.
This is not true! Portra 400 (or any color negative film) won't shoot well at all at 1600. A 1600 color negative film will do well shooting at 400 but not the other way around. So to expose Portra 400 at 1600 you must push develop otherwise your pictures will be very severe underexposed.