View Full Version : help!

01-25-2006, 05:03 PM
so i am making an anamorphic camera and trying to figure out the f-stop... do i measure from the pinhole to the closest edge of the film, the far edge, the middle? once again i am totally lost.

01-25-2006, 05:05 PM
i measure from the pinhole to the middle of the film.

01-30-2006, 06:21 PM
Measuring to the center of the film will require giving extra exposure to account for light falloff. You can factor that out if you take the average of the center distance and corner distance; you'll then automatically get a little overexposure in the center, but less underexposure at the ends.