Explore Scientific 92° ED Series 20mm Waterproof Eyepiece

Explore Scientific 92° ED Series 20mm Waterproof EyepieceUltra wide field eyepieces at the 92 class have traditionally been heavy, expensive, and limited to a few focal lengths. The Explore Scientific 92 ED Series 20mm Waterproof Eyepiece delivers a 92 apparent field of view with extra low dispersion glass, waterproof argon purged construction, and long eye relief immersive panoramic viewing without the weight premium of older ultra wide designs. The ED glass reduces color fringing that plagues standard

Ultra-wide-field eyepieces at the 92° class have traditionally been heavy, expensive, and limited to a few focal lengths. The Explore Scientific 92° ED Series 20mm Waterproof Eyepiece delivers a 92° apparent field of view with extra-low dispersion glass, waterproof argon-purged construction, and long eye relief — immersive panoramic viewing without the weight premium of older ultra-wide designs.

The ED glass reduces color fringing that plagues standard ultra-wide eyepieces, especially at the field edges where chromatic aberration is most visible. At 92°, the apparent field is wide enough to create a genuine sense of being immersed in the star field rather than looking through a window. The waterproof, argon-purged housing is built for all-night sessions regardless of humidity or dew conditions.

Key Features

• Extra-low dispersion glass — minimized chromatic aberration for clean, high-contrast views across the full 92° field
• 92° apparent field of view — among the widest available, creating a truly immersive observing experience
• Waterproof and argon-purged — sealed against moisture and internally fog-proof
• Long eye relief — comfortable for extended sessions and eyeglass-compatible
• 2" barrel — maximum light throughput and field stop diameter for ultra-wide-field performance
• Enhanced multi-layer deposition coatings on all air-to-glass surfaces

Ideal For

Medium magnification with an immersive panoramic field — ideal for extended nebulae and open clusters. The 92° field transforms the observing experience — targets fill the eyepiece rather than floating in empty space. An ideal upgrade for Dobsonian owners, deep-sky visual observers, and anyone who values the immersive experience of panoramic astronomical viewing.