In 35mm land, assuming that I intend to fill the frame with the subject, I typically use 50-75mm lenses for bust-length portraits, 90-135mm for face-only portraits, and 28-50mm for full-length/environmental portraits. What would the equivalent lengths be for large format, or rather, what do people find themselves using for these tasks?
I would do a simple comparison based on image diagonal, but I know that the magnification changes when you get up close with a large-format camera, so I don't know how much that effects the focal lengths of lenses used.
Bookmarks