Explore Scientific 9mm 62° 1.25" Waterproof Eyepiece
The Explore Scientific 9mm 62° Series 1.25" eyepiece brings together solid performance, quality optics, and weather-resistant durability in a compact and affordable package. It’s a favorite focal length for high-power observing with excellent eye relief and a wide field that doesn’t feel cramped — making it an excellent choice for planetary, lunar, and double star observation, as well as for resolving detail in globular clusters and planetary nebulae.
Designed with the amateur astronomer in mind, the 9mm 62° Series eyepiece offers a comfortable balance between magnification and usability. The 62-degree apparent field of view provides a generous window onto the cosmos, significantly wider than traditional Plössl designs, allowing for more immersive views without the need for constant nudging of the scope — especially useful when observing without tracking.
High-Contrast Optics with Fully Multi-Coated Elements
Explore Scientific’s 62° Series eyepieces use fully multi-coated optics to maximize light transmission and contrast. Each glass element is carefully matched and precision polished to minimize light scatter, reduce ghosting, and preserve image sharpness across the entire field. Edge-blackened optics further enhance contrast and reduce internal reflections, especially when viewing bright targets like Jupiter or the Moon.
The 9mm focal length is particularly well-suited for mid-to-high power views with most telescopes. In an 8" f/10 Schmidt-Cassegrain, it delivers approximately 222x magnification, ideal for bringing out detail on Saturn’s rings or resolving the core of M13. With shorter focal length refractors or Newtonians, it becomes a planetary workhorse, capable of teasing out fine surface features on Mars or subtle color differences in double stars.
Waterproof and Argon-Purged for Maximum Durability
Like all eyepieces in the Explore Scientific waterproof series, the 9mm 62° model is sealed and purged with dry argon gas. This protects the internal lens elements from moisture, dust, and internal fogging — a major advantage for observers who deal with humidity, dew, or temperature changes throughout the night. It also means you can clean the outer optics safely and thoroughly without worrying about compromising the internal seals.
The waterproof design makes this eyepiece a great companion for field use, public outreach, or any situation where gear might be exposed to less-than-perfect conditions. It’s peace of mind knowing your investment is protected from the elements.
Comfortable Eye Relief in a Compact Package
With 15mm of eye relief, the 9mm 62° Series provides a comfortable viewing experience for most observers, including those who wear glasses. The fold-down rubber eyecup offers additional comfort and helps block stray light from entering around the eye. The 1.25" barrel is threaded for standard filters and features a safety undercut to help prevent accidental slips when securing it in a diagonal or focuser.
Despite its rugged construction and premium features, the 9mm remains lightweight and compact — an excellent fit for grab-and-go setups or travel kits where every ounce and inch counts.
Perfect for Expanding Your High-Power Eyepiece Lineup
If you're looking to upgrade from stock eyepieces or round out your collection with a dependable, wide-field, high-magnification option, the Explore Scientific 9mm 62° is a smart choice. It combines optical quality, field performance, and build durability in a single, affordable package that punches well above its weight.
Whether you're chasing tight lunar rilles, crisp planetary detail, or tight double stars, this eyepiece delivers — night after night.
