Explore Scientific 52° Series 40mm Waterproof Eyepiece

The Explore Scientific 52° Series 40mm Waterproof Eyepiece is the longest focal length and longest eye relief in its series, and the only 2-inch O.D. eyepiece in the 52° line. Its huge true field of view is built for deep-sky observers pushing toward the faintest observable limit of their telescope, aimed at viewing large targets like the Andromeda Galaxy, the Rosette Nebula, and big star clusters. Waterproof, argon-purged construction keeps it usable in dewy or humid field conditions.

• 52° apparent field of view: Excellent eye relief and value versus a comparably priced Plossl.
• 40mm focal length, 2in O.D.: Only 2-inch outer diameter eyepiece in the 52° Series, for the widest true field.
• Waterproof, argon-purged construction: Built to hold up to field conditions including moisture.
• Suited to faint deep-sky targets: Aimed at observers pushing toward the faintest observable limit of their telescope.