Explore Scientific 52° Series 1.25" 3mm Waterproof Eyepiece

The 52° Series 3mm delivers the highest magnifications in the lineup, revealing tight double-star splits and fine planetary surface detail on nights of steady seeing. At this price, argon-purged waterproof construction and fully multi-coated optics are genuinely uncommon.

Key Features

• Argon-purged waterproof housing — sealed against moisture, fog, and humidity so dew-heavy nights never cut a session short
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces for high contrast and light transmission
• 4-element, 2-group optical design with edge-blackened elements to control stray light
• Fold-down silicone rubber eyecup with comfortable eye relief for extended observing, including with eyeglasses
• 1.25" barrel fits standard focusers on refractors, reflectors, and catadioptric telescopes

Ideal For

• Planetary observers chasing fine detail in Jupiter's cloud bands, Saturn's Cassini Division, or Mars surface features
• Double-star enthusiasts who need the magnification to split tight pairs
• Budget-conscious astronomers who want sealed, coated optics without paying a premium