Backed by 70 years of Japanese optical excellence, the Kowa TSN-99 Prominar Angled Spotting Scope delivers stunning image quality that has to be seen to be believed. It starts with a large, 99mm pure fluorite crystal objective lens paired with Kowa's XD concave lens, which produces second-to-none low-light performance and exquisite detail. This combination of elements combined with Kowa's enhanced optical coatings virtually eliminates chromatic aberration even at the highest magnification. Protecting the TSN-99's high-performance optics is an incredibly strong-yet-lightweight magnesium alloy chassis. Magnesium alloy delivers all the strength of metal without the unnecessary weight. Kowa's unique KR coating actively repels dirt, moisture, and dust from the surface so you can count on it to perform in bad weather. The TSN-99 also features Kowa's dual-focus system, giving you a higher degree of control between the image and your eye. As a bonus, the TSN-99 features an easy-access collar for quick transformation into a telephoto lens system, and Kowa offers a full range of digiscoping accessories. Premium fluorite crystal objective lens XD concave lens Exceptional low-light performance with a high level of detail Enhanced optical coatings reduce chromatic aberration Strong-yet-lightweight magnesium alloy chassis KR lens coating repels dirt, moisture, and dust Dual-focus system Easy-access collar for digiscoping