HIGH MAGNIFICATION: Upgraded HD monocular telescope features high magnification, combined with 18MM eyepiece and 50MM objective lens, to provide you with clearer and brighter images, more comfortable viewing experience and a wider field of view. ADVANCED OPTICAL TECHNOLOGY: Our ultra zoom birding telescope adopts the latest optical technology. In order to avoid vignetting and restore the true color, the BAK4 prism is configured, which has a higher refractive index than ordinary glass and provides a clearer image. Combined with an FMC broadband coating to minimize chromatic aberration, the image has excellent contrast and resolution. ONE-HANDED FOCUS: Say goodbye to the era of bulky binoculars ! The portable and compact design of our birding monocular allows you to quickly and accurately aim at the target with one hand. It weighs only 10 ounces and 15 cm in height, can be easily put in any pocket. What's more, whether you wear glasses or not, the rotating eyepiece can give you the best view.