Review on High-Definition Monocular Telescope with Zoom for Smartphone - Waterproof, Fogproof, Easy Focus - Ideal for Adults, Hiking, and Hunting by Rob Rogers

Unit arrived and works well. As with other mounts, it is not easy to adjust the lens to the phone's camera. but once it's set up, it's good. Quality and sharpness are quite decent. The tripod looks a bit fragile, but serves its purpose. Overall, this is a good addition for viewing or photographing. The increase is not 300, but more like 30.