muralist opened this issue on Nov 07, 2009 ยท 3 posts
Keith posted Mon, 09 November 2009 at 2:29 PM
For a rectilinear lens (that is, one that minimizes fisheye-style distortion), the formula is:
FOV = 2 arctan (x / (2 f)), where x is the diagonal length of the film.
There's a converter here .