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. 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. Portable monocular telescope focus wheel can be easily adjusted with a single hand, which is the most user-friendly bird monocular.