Not like that. SLRs don't have a built-in lens to contend with, and merely putting another lens over the iPhone's integrated one won't have the desired effect.

Not like that. SLRs don't have a built-in lens to contend with, and merely putting another lens over the iPhone's integrated one won't have the desired effect. There are adapters where the integrated lens is focused on a flat disk of ground glass that's vibrated to move the grain around. The principal lens then projects an image onto the ground glass for the camera to record. This technique was used way back with camcorders and such to get a full frame effect on the cheap, before the DSLR video phenomenon happened. While it's unclear if Panavision's implementation uses vibrating ground glass, the fundamentals will be the same: the iPhone is recording an image that's been projected onto an external surface. Incidentally, I think an advert for one of those camcorders back in the day that used this technique would be decidedly judged as deceptive!