Product Overview

Built for serious glassing, the Pentax SMC XW 20mm Eyepiece slots straight into your Pentax spotter or any 1.25" focuser and gets to work. With a generous 70° apparent field of view and a true 20mm of eye relief, it gives you a wide, relaxed picture that stays sharp right to the edge – ideal when you’re picking birds off a distant shoreline or sorting detail on a mob of goats across the valley. High‑refraction, extra‑low‑dispersion lanthanum glass and Pentax’s legendary SMC multi‑coatings keep the image bright and clean, with minimal colour fringing even in harsh Aussie light.

The XW 20 is weatherproof to JIS Class 4, so it’s happy working in drizzle, coastal spray or night dew without you babying it. The helicoid eyecup lets you dial in the perfect eye position whether you’re wearing sunnies or specs, and the solid build means it’ll handle being knocked around in the ute or pack. If you want a fixed‑power eyepiece that delivers comfortable long stints behind the scope and rock‑solid optical performance, this 20mm XW is a proper upgrade over stock glass.

Key Features

• 20mm focal length eyepiece delivers low to medium magnification, ideal for wide-field views of wildlife or night sky targets.
• Generous 70° apparent field of view provides an immersive, wide-angle image so you can see more of the scene without constant repositioning.
• Long 20mm eye relief offers comfortable viewing for extended sessions, including for users who wear glasses.
• High-refraction, extra-low-dispersion lanthanum glass elements minimise distortion and chromatic aberration, producing crisp, high-resolution images.
• Fully multi-coated optics and Pentax SMC coatings boost light transmission and contrast, improving clarity in low-light dawn, dusk, or night conditions.
• JIS Class 4 weatherproof construction protects the eyepiece from drizzle and dew, supporting reliable performance in changing outdoor conditions.
• 1.25" (31.7mm) barrel fits Pentax PF series spotting scopes and most telescopes with standard 1.25" focusers, adding versatility across multiple setups.
• Helicoid-type eyepiece ring and adjustable eyecup help you fine-tune eye position, reducing blackout and improving viewing comfort.
• Robust build with metal barrel and quality rubberised grip ensures durability and secure handling, even when wearing gloves.
• Engineered optical design with 6 elements in 4 groups reduces internal reflections, delivering bright, high-contrast views edge to edge.