Explore Scientific 62° 5.5mm Waterproof Eyepiece - 1.25"

A Flat-Field 62° View for High-Contrast Observing

With a 62° apparent field, this eyepiece offers a noticeably wider and more comfortable window onto the universe than standard Plössls. The flat-field, multi-element optical design ensures sharp focus from the center to the edge of the view, a critical feature when tracking objects across the field at high power. The excellent contrast makes it easier to employ averted vision to detect faint planetary moons or subtle details in brighter nebulae.

Argon-Purged Waterproofing in a 1.25" Barrel

Built to withstand challenging field conditions, this eyepiece is fully waterproof and purged with inert argon gas. This process seals the internal optics, preventing moisture from fogging the lens elements during nights with heavy dew and protecting the coatings from fungus and dust over the long term. The 62° series is also designed to be near-parfocal, minimizing the amount of refocusing needed when you switch between different focal lengths in the same lineup.

Explore Scientific 62° 5.5mm vs. a Standard 5.5mm Plössl

While a standard Plössl eyepiece is a reliable workhorse, the Explore Scientific 62° 5.5mm represents a significant step up in several key areas.

• Field of View: The Plössl design is typically limited to a 50-52° apparent field, while the ES 62° provides a wider, more immersive view that feels less like looking through a tunnel.
• Edge Correction: The ES 62° uses a more complex, flat-field optical design to correct for aberrations at the edge of the field, especially noticeable in faster telescopes where a Plössl might show distorted stars.
• Durability: The waterproof and argon-purged construction of the ES 62° is a professional feature not found in standard eyepieces, ensuring reliability and longevity in all weather conditions.