The Kenko Pro Field Spotting Scopes feature rugged and water-resistant construction, with a built-in sliding sun shade. The objective lenses and a quality porro prism provide outstanding performance for light-critical applications such as birding at dusk or dawn, and viewing in shaded area conditions. These Japanese-made optics outperformed many competing models in its price range or higher. The eyepiece zooms smoothly which allows you to search for a subject at a low-magnification, and then zoom in for high power magnification viewing. They’re also interchangeable with optional Kenko eyepieces: 15X, 20X, 35X, 50X and 70X.