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