Pentax 12x50 PCF WP II Binoculars with Casebr Nitrogen-filled waterproof construction allow these binoculars to be used in the most extreme weather conditions and be submerged to 1 meter br Aluminum-diecast body adds strength and durability br Long eye-relief for viewing with or without glasses br Mechanical focus lock feature allows user to lock in at a specific distance for convenient focus-free viewing br Click-stop diopter adjustment locks in right eyepiece diopter setting