These compact binoculars are brighter, sharper and more rugged than many other glasses with this lens diameter. Their high level of optical and mechanical performance is the result of specially designed eyepieces. The construction guarantees a sharp view without color fringing from edge to edge. In addition, the full rubber-armour makes the Leica Ultravid BR very resistant and reliable in any situation. 10x magnification, 25mm front lens diameter.