Large eyepiece monocular telescope1. Adopts premium material, thesell is sturdy, lightweidht, durable, rainproof.2. Lens is made of high quality material wiyh multiple coatings, clear and anti-scratch.3. With the BAK-4 crystal prism and FMC(multi-coated) 50mm objective lens, this monocular delivers brighter, clearer image.4. Abjustable focal length, 10-30 times magnification provide excellent usage experience, 10-30 times can be mediated at will according to need.5. Versatile for outdoor activities, like bird watching, hiking, climbing, sailing, etc.Specifications:Type: MonocularsMagnification: 10-30Objective Lens Diameter: 50MMExit Pupil Distance: 15.1MMExit Pupil Diameter: 5.6MMClose Focus: 5MVision: 130M/1000MEye Cup Type: SpinFocusing: Mid-focusAngular field of view: 5.6at10x~2.7at30xOptical System: Roof opticsPrism:BAK4Waterproof system: Nitrogen-filled and waterproof and anti-fogCoating: FMC Full Broadband Green FilmMaterial: ABSSize: app.11.8x6cm/4.65x2.36inQuantity: 1 Set