65mm Objective Lens: The PF-65ED II features a compact yet capable 65mm diameter objective lens. ED Glass: This spotting scope incorporates Extra-low Dispersion (ED) glass elements in its optical design. Straight Viewing Design: The PF-65ED II spotting scope features a straight-through viewing design, which provides a more intuitive and comfortable viewing experience, especially for quickly locating and tracking moving subjects. Compact, high-performance spotting scope Provides a clear image field in all types of observations Straight-line barrel lets you spot the subject swiftly Incorporates ED (Extra-low Dispersion) glass elements Accepts any of the three SMC Pentax XF-series eyepieces Durable, shock-proof rubber housing JIS Class 6 waterproof construction Nitrogen-filled body to prevent fogging