The Barska Gladiator Zoom Binoculars (10-30x50mm) are ideal for long-distance terrestrial observation as well as astronomical viewing. Their variable magnification lets you survey a wide field and then zoom in for a closer, more detailed look at your chosen target. A convenient zoom thumb-lever allows for quick and smooth adjustments. The eyepieces feature fold-down eyecups for comfortable viewing, whether you wear glasses or not.