The Athlon Cronus 12-36x50 ED 45DegreesSpotting Scope is one of the worlds best spotting scopes with brighter and clearer edge-to-edge detail. The Cronus product line has just about every feature you would put in a scope to make it the best you can get in its class. It has an apochromatic system to give you images that have greater contrast, sharpness, and color definition. It also comes withan ED Glass that results in a clearer and sharper image to your eyes, the state-of-the-art ESP (Enhance Spectral Prism) dielectric coating that reflects 99% of the light through the prism assembly and other design enhancements likeBaK-4 prisms and advanced fully multi-coated lenses that deliver flawless color fidelity, ultra-crisp images, and optimum light transmission. Finally, the XPL Lenses coating helpsprotect the exterior lenses from scratches, dust, and anything else mother nature throws at you.- Extremely Compact and Lightweight- 45 Angled Viewing- 12-36x Zoom Eyepiece- 50mm Objective Lens- Dielectric Coated BAK4 Prism System- Apochromatic Extra-Low Dispersion Lens- Durable and Lightweight Magnesium-body- Two-Speed Focusing Mechanism- 1/4"-20 Mount, Rotating Tripod Collar- Soft Carrying Case- Lens Cloth- Eyepiece Cap- Objective Lens Cap- Limited Lifetime WarrantySpecifications:Magnification: 12-36xObjective Lens Diameter: 50mmField of View: 171-90 @ 1000 Yards /30m @ 1000 MetersMinimum Focus Distance: 8mEye Relief: 17.8-15mmExit Pupil Diameter: 4.3-1.4mmFilter Thread: No ne.weatherproofing: Argon-filled, waterproof and fog proofDimensions: 24.9 x 6.6 cmWeight: 751.3g