4K 10-300X40mm Super Telephoto Zoom Monocular Telescope PortableProduct selling points:[Super telephoto lens monocular]: The telescope's anti-shake system and special tripod 3D gyroscope make the telescope's field of view very stable when magnified multiple times.[Small light night vision]: The built-in night vision function allows you to use it normally at night. Turn on the auto focus and blur the background function, brake you can focus on observing the person or object that needs to be observed.[Lightweight and portable]: The shell is made of titanium alloy, which has higher specific strength and weighs only 1.1 pounds. When stowed, the length is only 7.87 inches, and you can easily put it in a backpack or pocket when hunting, traveling or camping.[Waterproof, dusproof, shockproof design]: Nitrogen-filled waterproof and O-ring optical components can prevent moisture, dus and debris, and ensure the waterproof function of life.[Ideal for outdoor sports enthusiasts and wilderness explorers]: Hand-held equipment is essential equipment for bird watching, wildlife, hunting, hiking, mountain climbing, camping, camping, surveillance and travel.Description:Objective lens diameter: 30mmMagnification: 7-17 times (corresponding to adjustment level 10X100)Eyepiece diameter: 22mmExit pupil diameter: 4.2-1.7mmEye relief: 14-12mmField of view: 230-110FT 1000YDSField of view: 4.4-2.1 degreesMinimum focusing distance: 2.5mSize: 173/128x43mm (stretching and shrinking)Weight: 300gPrism: BAK4 prismCoating: FMCColour: BlackEye mask: rotating eye maskWaterproof: yesTripod can be connected: YesConnected phone: yesUsed for: racing, beach, bird watching, boating/yachting, horse racing, hunting, outdoor activities, sports, theater, travelMaterial: optical glassType: MonocularProduc