FeaturesHigh magnification of 18xLarge diameter 50mm objective lensWide field-of-view of 67 degreeLong eye-relief of 15mmImage stabilizerUD element reducing chromatic lens aberrationsSuitable for use in all weather conditionsDesigned for professionals and uncompromising enthusiasts, this high-magnification binoculars incorporate innovative technologies that set a new standard of performance.Features High magnification of 18x Large diameter 50mm objective lens for a bright field-of-view Wide field-of-view of 67 degree Long eye-relief of 15mm Image stabilizer UD element reducing chromatic lens aberrations Suitable for use in all weather conditions High-power binoculars with Image Stabilizer and all-weather design The 18x50IS AW is unique among high- magnification binoculars because they incorporate Canon remarkable Optical Image Stabilizer technology. Proven highly effective in Canon video camcorders and professional lenses, this revolutionary system employs a novel Vari-Angle Prism that instantly and continuously makes adjustments to maintain a steady image. With Canon Optical Image Stabilizer, you can enjoy the resolving power of these binoculars without a tripod. You can even use them from within moving vehicles. Their shake-free performance not only enhances your ability to view fine detail but also reduces eye strain and fatigue. The IS series feature eyepiece lenses with a unique Doublet Field Flattener, which dramatically reduces curvature of field. As a result, there is none of the image distortion and blurring at the periphery typical of high-magnification binoculars. This advanced design also results in long eye relief, which enables eyeglass wearers to view the entire field without vignetting. Canon superior optical engineering also provides unusually wide apparent field-of view. This is particularly important in high-magnification binoculars as it makes it easier to locate your desired subject.