Kowa's 88mm Prominar spotting scope takes image quality to the max by incorporating fluorite crystal lenses. With the enhanced resolution, color, and contrast, customers enjoy the ultimate viewing experience. An 88mm objective lens offers terrific light-gathering power for long distances and low light settings. Kowa engineers offset the length and weight associated with a large objective lens by incorporating an inner focus system and a magnesium alloy body. With the eyepiece locking mechanism, the eyepiece securely attaches to the body and reduces the risk of loss. The waterproof and fogproof body adds protection from rain and temperature fluctuations. Kowa offers a limited lifetime warranty for this scope.