Emarth High Power 10-20X50 Zoom Monocular Telescope BAK4 Prism Waterproof Fog Proof Men Gifts For Bird Watching Camping Hunting Wildlife Traveling Advantages and Key Features Powerful zoom magnification range that adjustable 10x to 20x magnification, both perfect for short and long distance viewing, one Emarth zoom monocular is enough for most occasion more than 10 different magnification monocular. 50mm FMC objective lens, BAK-4 prism, Porro prism system, all these high end configuration delivered you brighter, clearer and more brightness image. Nitrogen-filled, IPX7 waterproof, fog proof, strong enough for any harsh and extreme environment. Use with or without glasses - Adjustable the folding rubber eye-cup turn over and down for comfortable viewing with or without eyeglasses. 1/4""-20 tripod threads hole on the bottom of the monocular - You can connect it to a most of the optics tripod. Specifications: Objective Lens: 50mm Magnification: 10x-20x Exit Pupil Diameter: 5.5-2.7mm Field of view: 75-52M / 1000M Focusing System: Fix. Focusing Lens: Eye Lens Coating: FMC Nitrogen Filled: YES Dimensions: 190x80x61mm Weight: 453g Packing list: 1x 10-20X50 Monocular 1x Carrying bag 1x Eyepiece and Lens Protection Covers 1x Cleaning Cloth 1x Straps