Pentax Eyepiece XW-16.5
Pentax XW-16.5 gives you a sharp, 85° wide field and long 20mm eye relief, so you can pick apart detail in distant game or night sky targets without eye strain. Built weatherproof and tough for serious glassing sessions.
Product Overview
The Pentax Eyepiece XW-16.5 is built for people who actually get out under the sky and put their gear to work. With a huge 85° apparent field of view and a generous 20mm of eye relief, it gives you that “picture window” feel on nebulae, clusters and wide star fields while still being comfortable for long sessions – even if you wear glasses. The 2" barrel drops straight into modern focusers and diagonals, and the helicoid eyecup lets you dial in the perfect eye position for your observing style.
Inside, Pentax have used high-refraction, extra‑low‑dispersion lanthanum glass and their famous SMC multi‑layer coatings to keep contrast high and aberrations low. Blackouts and edge mush are kept in check, so faint detail in galaxies, emission nebulae and globulars stands out cleanly against a dark background. The XW-16.5 is weatherproof to JIS Class 4, so it’s happy working through dew and drizzle – ideal for real-world Aussie conditions where the forecast doesn’t always play ball.
Key Features
- 85° apparent field of view delivers an expansive, immersive sky or landscape, making it easier to frame large nebulae, star clusters and wide terrestrial scenes.
- Long 20mm eye relief provides comfortable viewing for extended sessions and is ideal for users who wear glasses due to astigmatism.
- High-refraction, extra-low-dispersion lanthanum glass minimises chromatic and other aberrations, producing sharp, high-contrast images across the field.
- PENTAX SMC multi-layer and partial coatings achieve over 90% light transmission (up to 96% at 550nm), enhancing brightness and low-light performance at dawn, dusk and under dark skies.
- Advanced internal light-shielding diaphragm reduces stray light and reflections, improving contrast so faint deep-sky objects and subtle terrestrial details stand out more clearly.
- Weatherproof JIS Class 4 construction allows reliable use in drizzle and dewy night conditions, protecting the optics during typical outdoor observing sessions.
- 2" (50.8mm) barrel fits standard large-format telescope focusers, providing secure mounting and compatibility with a wide range of astronomical setups.
- Helicoid-style adjustable eyecup and light shield help you position your eye optimally, improving comfort and maintaining maximum contrast during long observations.
- Seven-element, five-group optical design keeps star images sharp to the edge of the field, maximising usable viewing area for sweeping the sky.
- Robust 745 g build with precision machining offers a solid, stable feel in the focuser, supporting repeatable, accurate alignment for serious observing.
Included in the Box:
- Pentax Eyepiece XW-16.5
- Eyepiece lens cap
- Objective lens cap
- Case
| SKU | PEN70540 |
| Model # | 70540 |
| Brand | Pentax |
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