20 mm Objective Lens: Pocket Handheld Monocular telescope uses a high-end BAK4 prism; 12 mm eyepiece with FMC broadband green film plating, can effectively eliminate the internal light dispersion of the glass, reduce internal light loss and high transmittance, more transparent field of view HD Lens: Monocular telescope for adults and kids eyepiece is made of high-definition transparent blue film optics, the imaging is clear and bright, so you can see very clearly at night; 8 x 20 zoom monocular with a viewing angle of up to 8 x and a 20 mm objective lens for a clearer and brighter view Easy to Use: Portable monocular telescope focus wheel can be easily adjusted with a single hand, which is the most user-friendly bird monocular; The eyecup swivels up and down quickly and easily for optimal viewing with or without glasses, allowing your phone to embrace nature more clearly Widely Used: This mini telescope has a large field of view; Suitable for watching birds, concerts, sporting events, hiking, camping, traveling, observing nature, landscapes, and so on; Field of view between 96 meters and 1000 meters