Explore Scientific 52° Series 1.25" 4.5mm Waterproof Eyepiece

The 52° Series 4.5mm strikes a practical balance between high magnification and usability, delivering detailed planetary views without demanding perfect seeing conditions. Argon-purged waterproof construction at this price point means you can observe confidently through dew and humidity.

Key Features

• Argon-purged waterproof housing — sealed and fog-proof for reliable performance in any weather
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces maximize contrast and brightness
• 4-element, 2-group optical design with edge-blackened elements to suppress scattered light
• Fold-down silicone rubber eyecup provides comfortable eye relief for extended sessions, with or without eyeglasses
• 1.25" barrel compatible with standard focusers across telescope types

Ideal For

• Planetary observers who want detailed views of Jupiter, Saturn, and the Moon without pushing magnification to its limits
• Lunar observers exploring crater detail, rilles, and mountain shadows at high power
• Beginners stepping up from kit eyepieces who want better optics and weather protection at an affordable price