Porro Prism - Porro prisms only displays gentle 4 times and it comes out on a special line than it went in on, leading to the need for a bigger body and for this reason Porro prism binoculars are heavier than roof prism binoculars. Featuring a high efficiency optical program https://guidemysocial.com/story3408437/rumored-buzz-on-hunting-supplies-uk