SP 10x50 Binoculars

A very important factor in considering optics is how well they will withstand different conditions. The weatherproofing designation will determine how well they are covered by the manufacturer warrantee, will they fog up if brought into the cold, and how they will do if accidentally splashed...et. Full descriptive text along with how the manufacturers rate and cover optics can be found in the Basics III article in the All About Optics section.