Product Overview

The Pentax SMC XW 5mm Eyepiece is built for serious glassers who want crisp detail and a wide, comfortable view from their spotter or scope. With a 70° apparent field of view and a generous 20mm of eye relief, it gives you that big-picture perspective while still letting you drill into fine detail – even if you’re wearing sunnies or specs. High‑refraction, low‑dispersion lanthanum glass and Pentax’s Super Multi Coating (SMC) keep the image bright, sharp and neutral, with minimal aberrations and excellent contrast in real-world conditions.

Designed around the 31.7mm (1.25") standard barrel, the XW 5mm drops straight into most telescopes and Pentax PF‑series spotting scopes, making it a versatile upgrade for both hunting and astro use. JIS Class 4 weatherproof construction means it’s happy working in drizzle, night dew and dusty paddocks, while the helicoid eyepiece ring lets you fine‑tune eye position for long, relaxed viewing sessions. If you’re chasing a compact, hard‑working eyepiece that pushes magnification without sacrificing comfort or field of view, this Pentax XW 5mm is a rock‑solid choice.

Key Features

• 5mm focal length with a 70° apparent field of view delivers high magnification and a wide, immersive image, ideal for detailed astronomical and long-range terrestrial observation.
• Generous 20mm eye relief provides comfortable viewing over extended sessions, especially beneficial for users who wear glasses.
• High-refraction, low-dispersion lanthanum glass elements minimise aberrations and distortion, producing bright, high-resolution images with excellent edge-to-edge clarity.
• Fully multi-coated optics and Pentax Super Multi-Coatings (SMC) boost light transmission to over 90%, enhancing contrast and colour fidelity in low-light conditions such as dusk or night-time observing.
• JIS Class 4 weatherproof construction protects the eyepiece from drizzle and night dew, ensuring reliable performance in variable outdoor conditions.
• Eight-element, five-group lens structure with advanced light-shielding technology reduces internal reflections, improving image contrast for critical planetary and deep-sky viewing.
• Standard 1.25" (31.7mm) attachment diameter with filter-threaded, chromed barrel allows easy installation on most telescopes and spotting scopes and accepts common screw-in filters.
• Helicoid-type, twist-up eyepiece ring with rubber eyecup lets users quickly adjust eye position for optimal comfort and precise eye placement.
• Robust 395 g build quality offers a solid, stable feel on the instrument while remaining compact enough for field use and travel.
• Compatible with Pentax PF-65, PF-65 ED II, PF-80 and PF-100 series spotting scopes, giving users a versatile eyepiece that works across multiple bodies for both ground and astronomical applications.