Porro Prism - Porro prisms only reflects light 4 instances and it comes out on another line than it went in on, leading to the need for a bigger physique and for this reason Porro prism binoculars are heavier than roof prism binoculars. Featuring a high effectiveness optical technique with https://bookmarknap.com/story8295626/5-simple-techniques-for-hunting-binoculars