65, 80, and 100 mm Pentax Spotting Scopes are featuring time-proven porro-prism optics and extra large objective lenses, the Pentax PF-Series of Spotting Scopes produce sharp, clear images with minimal chromatic aberration. All Pentax spotting scope models feature lightweight magnesium-alloy bodies with waterproof/fogproof construction with a JIS Class 6 rating. 65 mm, 80 mm, 100 mm Spotting scopes from PENTAX feature High-refraction, low-dispersion, Lanthanum Crown (rare earth) glass elements are used for exceptional viewing and image quality. The 31.7mm American-standard eyepiece receptacle on each model accepts six different types of optional eyepieces. These versatile, heavy-duty Extra-low Dispersion ED glass and strong waterproof constraction makes Pentax Spotting Scopes a top choice for birders and hunters alike. Pentax Spotting Scopes are perfect for demanding use out in the field whether you are out looking for wildlife, birdwatching or stargazing.OpticsPlanet, Inc offers a full line of original Pentax Spotting Scopes with full manufacturer's warranty and Free Shipping on orders over $29.95!