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Model: PentaxXW10Part Number: 70514
Features
High-refraction, low-dispersion Lanthanum glass.
Pentax Super Multi-Coatings (SMC) on all air/glass surfaces.
Edge-blackened optics and optimised baffles minimise internal reflections.
Optically corrected for use with focal ratios as fast as f/4.
20mm eye-relief and twist-up rubber-rimmed eyecups - perfect for spectacle wearers.
Chromed barrels threaded to accept filters.
Weatherproof to JIS Class 4 standards.
Bought this eyepiece because it has long eye relief (20 mm) and relatively large field of view. I have used it with a Tak FC-100, Vixen SD81S, Vixen A80M and Celestron C8 on moon, planets, double stars and DSOs. Performance is excellent, producing excellent sharpness and contrast, and aberrations are extremely well controlled. Also, the eyepiece has an excellent quality feel to it. Highly recommended.