Waterproof fogproof and nitrogen purged 10x magnification objective lens diameter 42mm multi coated optics twist up eye cups with long eye relief 16mm ergonomic design roof prism structure large focus knob wide field of view get all the important features you need for success in the field with the praktica explorer 10x42 binoculars whether you are a birder hunter sports fan or traveller the explorer rubber armoured body protects your binoculars