Explore Scientific 52° Series 1.25" 6.5mm Waterproof Eyepiece

The 52° Series 6.5mm provides sharp, high-power views that remain usable across a wider range of atmospheric conditions than shorter focal lengths. Argon-purged waterproof construction and EMD coatings deliver performance well above its price class.

Key Features

• Argon-purged waterproof housing — sealed against moisture and fog for dependable all-weather observing
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces for bright, high-contrast images
• 4-element, 2-group optical design with edge-blackened elements to minimize stray light
• Fold-down silicone rubber eyecup for comfortable eye relief during long sessions, including for eyeglass wearers
• 1.25" barrel fits standard focusers on all common telescope designs

Ideal For

• Planetary observers who want crisp detail on Jupiter, Saturn, and Mars without requiring perfectly steady skies
• Lunar explorers studying craters, mountain ranges, and terminator detail at high magnification
• Visual astronomers working with faster telescopes (f/5–f/6) where a 6.5mm provides high power without excessive magnification