Explore Scientific 52° Series 1.25" 20mm Waterproof Eyepiece

Explore Scientific 52° Series 1.25" 20mm Waterproof EyepieceThe 52 Series 20mm is a go to general purpose eyepiece for comfortable, wide views of deep sky objects. Moderate magnification makes it forgiving and versatile, while argon purged waterproof construction and EMD coatings provide quality that outlasts cheap kit eyepieces many times over. Key Features Argon purged waterproof housing sealed against moisture and fog for reliable performance session after session Enhanced Multi Layer Deposition (EMD)

The 52° Series 20mm is a go-to general-purpose eyepiece for comfortable, wide views of deep-sky objects. Moderate magnification makes it forgiving and versatile, while argon-purged waterproof construction and EMD coatings provide quality that outlasts cheap kit eyepieces many times over.

Key Features

• Argon-purged waterproof housing — sealed against moisture and fog for reliable performance session after session
• 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 suppress stray light
• Fold-down silicone rubber eyecup with comfortable eye relief for relaxed viewing, including with eyeglasses
• 1.25" barrel fits standard focusers across all common telescope designs

Ideal For

• Deep-sky enthusiasts framing open clusters, nebulae, and galaxies at magnifications that show structure without dimming the view
• Star party hosts who need a comfortable, easy-to-use eyepiece that visitors can look through without fussing with eye placement
• Kit eyepiece upgrades — a 20mm is a natural replacement that immediately improves contrast and sharpness