I came across this short PDF from Panavision (http://www.panavisio...pective (3).pdf) that explains how focal lengths work, and I found this on page 8...
Let’s assume that the central Field of View of human vision has an angle of about 45 degrees, with Perspective corresponding to roughly a 40mm lens. To get the same Field of View in Super 35 you need to shoot with a 27mm lens, or thereabouts, but then the perspective will feel a little exaggerated. To get a similar Field of View with a Dragon 6K, you would shoot with a 35mm, which is closer to 40mm and would yield a less exaggerated, more natural perspective. Of course the filmmaker may want to exaggerate the perspective with wider lenses, or flatten it with longer ones, nevertheless the relationship of Angle of View to Perspective remains different with bigger sensors than with Super 35.....Some Panavision engineers, and notably the late Tak Miyagishima, have stated that the “natural” Perspective of bigger formats is scalable: that shooting larger formats will seem more natural no matter what the focal length. In this view, shooting with a wide- angle lens is simply equivalent to moving closer to the subject, while shooting with a longer focal length is like moving farther away, but in both cases the relationship of Perspective to Field of View retains its “natural” feel.
...which made me very confused. What is the difference between field of view and perspective? If you were film a person's face with a 50mm lens on Super 35mm, would you get the same field of view but a "flatter" face if you filmed the face from the exact same angle and distance with a 75mm lens on Vistavision?
P.S. Or maybe Panavision is putting a bit of false advertising in there to make filmmakers who don't fully understand how focal lengths work buy Primo 70 lenses. You never know.
Edited by Leon Liang, 19 December 2015 - 11:58 AM.