Explore Scientific 52° Series 1.25" 25mm Waterproof Eyepiece

Explore Scientific 52° Series 1.25" 25mm Waterproof EyepieceThe 52 Series 25mm provides the widest field of view available in a 1. 25" barrel at this focal length, framing large deep sky targets with comfortable eye relief and low magnification. Argon purged waterproof construction means it handles years of dew soaked sessions without complaint. Key Features Argon purged waterproof housing sealed and fog proof for reliable observing in humidity, dew, and temperature swings Enhanced Multi Layer Deposition (EMD)

The 52° Series 25mm provides the widest field of view available in a 1.25" barrel at this focal length, framing large deep-sky targets with comfortable eye relief and low magnification. Argon-purged waterproof construction means it handles years of dew-soaked sessions without complaint.

Key Features

• Argon-purged waterproof housing — sealed and fog-proof for reliable observing in humidity, dew, and temperature swings
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces maximize brightness across the field
• 4-element, 2-group optical design with edge-blackened elements to suppress internal reflections
• Fold-down silicone rubber eyecup with generous eye relief for comfortable extended viewing, including with eyeglasses
• 1.25" barrel fits standard focusers on refractors, reflectors, and catadioptric telescopes

Ideal For

• Deep-sky observers sweeping through open star clusters, large nebulae, and galaxy groups at low power where brightness matters
• Finder-eyepiece pairing — a low-power 25mm makes an excellent locator eyepiece for centering targets before swapping to higher magnification
• Wide-field scanning of the Milky Way, rich star fields, and extended objects like the Veil Nebula or North America Nebula