Explore Scientific 100° Series 3" 30mm Waterproof Eyepiece

The 100° Series 30mm is the largest and most immersive eyepiece in the Explore Scientific lineup — a 3" barrel design delivering the widest possible views with a 100° apparent field of view. This is not a conventional eyepiece; it is a premium wide-field instrument that transforms how you see the sky. Large nebula complexes, Milky Way star clouds, and sweeping star fields fill the eyepiece from edge to edge with a panoramic sense of depth that smaller eyepieces simply cannot create.

The premium multi-element optical design maintains sharp, well-corrected images across the full 100° field. The 3" barrel format delivers maximum light throughput and the widest true field of view achievable, making the most of large-aperture telescopes. Argon-purged waterproof construction keeps the optics sealed and clear through temperature swings, dew, and humidity — a practical advantage for an eyepiece that will spend long hours at the telescope during deep-sky sessions.

At $999, this is a serious investment — but comparable hyper-wide-field eyepieces from Tele Vue carry similar or higher price tags without waterproof construction. For observers who prioritize the wide-field deep-sky experience above all else, the 100° 30mm delivers it at the highest level.

Key Features

• 3" barrel — the largest barrel format available, delivering maximum light throughput and the widest true field of view possible
• 100° apparent field of view — hyper-wide panoramic views that create a genuinely immersive experience unlike any smaller eyepiece
• Premium multi-element optics — high-quality glass types maintain sharpness and correction across the enormous 100° field
• Argon-purged waterproof housing — sealed against moisture, fog, and temperature extremes, protecting a significant optical investment
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces with edge-blackened elements for maximum contrast
• Fold-down silicone rubber eyecup for comfortable eye positioning during extended sessions

Ideal For

• Dedicated wide-field deep-sky observers who want the absolute maximum field of view and immersion available — this is the pinnacle of the ES eyepiece lineup
• Large-aperture Dobsonian owners with 3" focuser capability who want to unlock their telescope's full wide-field potential
• Observers who have experienced 2" ultra-wide-field eyepieces and want to take the final step to the widest possible views
• Star party centerpiece — the 100° 30mm consistently creates the most memorable viewing experiences of any eyepiece in a collection