What is the difference between a “porro prism” binocular and a “roof prism” binocular?
Porro prism binoculars have the “offset” design. The eye pieces are not the same distance apart at the objective lenses. Porro prism binoculars offer great viewing performance, are more “traditional” and are generally less expensive to manufacture. “Roof prism” binoculars are distinguished by their “in-line” appearance. The eye pieces and objective lenses share the same axis. These binoculars also offer great viewing, are less bulky, and generally more expensive to manufacture. Both prism designs can provide great viewing and it is generally just personal preference that determines which one is best for you.
