Porro Prism - Porro prisms only demonstrates gentle 4 periods and it will come out on a distinct line than it went in on, resulting in the need for a larger body and for this reason Porro prism binoculars are heavier than roof prism binoculars. Phase corrected dielectric coated prisms https://moodjhomedia.com/story2284742/facts-about-hunting-shop-uk-revealed