Product Overview

The Pentax SMC XW 3.5mm Eyepiece is built for shooters and spotters who care more about performance than pretty marketing. Drop it into your Pentax PF-65, PF-80 or PF-100 and you’re straight into serious high‑magnification work – perfect for reading tiny groups at distance, picking impacts on steel, or pulling detail out of mirage when you’re tuning a load.

You get a tight 3.5mm focal length with a wide 70° apparent field of view, so you’re not peering down a tunnel – you’ve got room to scan and track. The 20mm eye relief and twist‑up rubber eyecup make it genuinely comfortable for long sessions, even with glasses on. High‑grade lanthanum glass and full multi‑coatings keep the image sharp, bright and clean right to the edge, with minimal colour fringing or flare.

Weatherproof to JIS Class 4, the XW 3.5mm is happy working in drizzle, night dew and the sort of coastal conditions Aussie shooters know too well. The 1.25" (31.7mm) barrel drops into standard astro and spotting scope bodies, and the build quality is classic Pentax – solid, precise and made to last. If you need a compact, hard‑working eyepiece that lets you actually see what your rifle and glass are doing at long range, this one earns its spot in the kit.

Key Features

• 3.5mm focal length eyepiece delivers high magnification, ideal for detailed planetary and long‑range terrestrial observations.
• Wide 70° apparent field of view provides an expansive, immersive image so you can see more of the scene without constant repositioning.
• Generous 20mm eye relief offers comfortable viewing for extended sessions and works well for users who wear glasses.
• High‑refraction, extra‑low‑dispersion lanthanum glass elements minimise chromatic aberration and distortion for crisp, high‑contrast images.
• SMC fully multi‑coated optics and innovative partial coatings exceed 90% light transmission, enhancing brightness and clarity in low‑light conditions.
• JIS Class 4 weatherproof construction allows reliable use in drizzle, night dew and other challenging outdoor environments.
• 1.25" (31.7mm) barrel diameter is compatible with standard telescope and spotting scope focusers for easy integration into existing setups.
• Advanced light‑shielding design reduces internal reflections and blackout effects, maintaining consistent contrast across the field.
• Robust, satin‑finish housing and adjustable rubber eyecup provide a secure, ergonomic grip and precise eye positioning.
• Optimised for Pentax ED spotting scopes and astronomical telescopes, delivering high‑resolution performance across multiple applications.