Product Overview

Built for serious glassing, the Pentax XF 8.5mm Eyepiece for Spotting Scope is a compact workhorse that punches well above its weight. With a 60° apparent field of view and long 18mm eye relief, it gives you bright, high-contrast views without crowding your eye – ideal for long sessions behind the scope, even with glasses on. The 8.5mm focal length delivers crisp detail and practical magnification across Pentax PF-65, PF-80 and PF-100 spotting scopes, making it a versatile choice for everything from tight bush gullies to wide open country.

Weather isn’t a worry either. JIS Class 4 water-resistant construction, fogproof performance and a robust metal body mean this eyepiece is ready for dew, drizzle and rough handling in the ute or pack. The twist-up helicoid eyecup with four positive click stops lets you dial in a comfortable eye position quickly, while the standard 1.25" barrel and filter thread slot straight into most astro and spotting rigs. If you want a no-nonsense, sharp-as eyepiece that just works in Aussie conditions, the Pentax XF 8.5mm is a smart upgrade to your glass kit.

Key Features

• 8.5mm focal length eyepiece delivers 46x magnification with PF-65 series spotting scopes, providing detailed views of distant subjects for birding and nature observation.
• Generous 60° apparent field of view lets you see more of the scene at once, making it easier to track wildlife and scan wide landscapes.
• Long 18mm eye relief and twist-up helicoid eyecup with four click-stop positions ensure comfortable viewing, even for users wearing glasses.
• High-refraction, low-dispersion lanthanum glass and Pentax smc multi-layer coatings minimise aberrations and flare, producing bright, high-contrast images in challenging light.
• Standard 1.25" (31.7mm) barrel with safety undercut is compatible with Pentax spotting scopes and most astronomical telescopes, adding versatility to your optics kit.
• JIS Class 4 weather-resistant construction protects the eyepiece from splashed water and light rain, supporting reliable performance in outdoor conditions.
• Compact 43 x 83mm housing and 150g weight make the eyepiece easy to carry and ideal for portable spotting scope and telescope setups.
• Parfocal design with the Pentax XF 12mm eyepiece allows swapping between magnifications without refocusing, saving time when conditions change.
• Accepts standard 1.25" filters, enabling quick adaptation for astronomical or terrestrial viewing such as contrast enhancement or light pollution reduction.
• Six-element, four-group optical design optimised by computer simulation reduces internal reflections, delivering clearer, sharper views across the field.