Explore Scientific 100° Series 2" 20mm Waterproof Eyepiece

The 100° Series 20mm delivers immersive, hyper-wide deep-sky views at moderate magnification: large nebulae, open clusters, and galaxy groups fill the 100° field with detail and surrounding context that creates a genuinely three-dimensional sense of depth. The premium multi-element optical design maintains sharpness across the enormous field. It has argon-purged waterproof construction.

Key Features

• 100° apparent field of view — the hyper-wide field creates an immersive, panoramic observing experience
• Premium multi-element optics — sharp, color-corrected images with strong edge performance across the full 100° field
• 2" barrel accommodates a 34.8mm field stop for a wide true field
• Argon-purged waterproof housing — sealed against moisture, fog, and temperature changes for all-season reliability
• Multi-layer coatings on all air-to-glass surfaces with edge-blackened elements for contrast
• Fold-down silicone rubber eyecup with comfortable eye relief for extended sessions

Ideal For

• Wide-field deep-sky observers framing large nebulae, open clusters, and galaxy groups within an immersive 100° panoramic view at moderate magnification
• Dobsonian and large-aperture telescope owners where a 20mm 100° provides an extraordinary combination of brightness, detail, and field width