Explore Scientific 100° Series 2" 5.5mm Waterproof Eyepiece

The 100° Series 5.5mm delivers the most immersive high-magnification views in the Explore Scientific lineup — a full 100° apparent field of view creates the sensation of floating directly through the star field. At high magnification, planets and tight deep-sky objects sit within a vast, sharp field that even 82° eyepieces cannot match. Argon-purged waterproof construction and premium multi-element optics at $299 place this firmly against the Tele Vue Ethos line at less than half the price.

Key Features

• 100° apparent field of view — a hyper-wide field that creates a genuinely immersive "spacewalk" experience unlike any narrower design
• Premium multi-element optics for sharp, well-corrected images across the enormous 100° field, even in fast telescopes
• 2" barrel — necessary for the extreme field width, providing maximum light throughput
• Argon-purged waterproof housing — sealed against moisture, fog, and temperature extremes for all-weather reliability
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces with edge-blackened elements for contrast
• Fold-down silicone rubber eyecup for comfortable eye positioning

Ideal For

• Planetary observers seeking maximum immersion — Jupiter and Saturn sit within an expansive field that makes tracking effortless and the observing experience transformative
• Double-star and compact deep-sky observers who want the context of the surrounding field while examining fine detail
• Observers who have experienced 82° and want to go further — the jump to 100° is the next step in the wide-field progression
• Budget-conscious observers seeking Ethos-class performance — comparable field width at a fraction of the cost