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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Explore Scientific 92° ED Series 9mm Waterproof Eyepiece

Explore Scientific 92° ED Series 9mm Waterproof Eyepiece

by Explore Scientific
SKU ES-EPWP9209ED-01
$449.99 - $449.99
$449.99
$449.99 - $449.99
$449.99
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  • 9mm Focal Length
  • 92° Apparent Field of View
  • 2-inch Barrel Diameter
  • Extra-Low Dispersion (ED) Glass
  • Waterproof and Gas-Purged Construction
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  • Explore Scientific 92° ED Series 9mm Waterproof Eyepiece

    The Explore Scientific 92° ED Series 9mm Waterproof Eyepiece delivers an ultra-wide 92° apparent field of view in a 9mm focal length, optimized for high-magnification planetary and deep-sky observation. This 2-inch barrel eyepiece is engineered to create a fully immersive, "spacewalk" experience, keeping targets in the view longer at high power and reducing the need for constant scope adjustments.

    A 92° Spacewalk: High-Power Views in a 9mm Eyepiece

    The 92° apparent field of view transforms high-power observing from looking through a keyhole into a panoramic experience. At the high magnification provided by the 9mm focal length, this expansive view allows you to frame not just Jupiter, but its Galilean moons in a single, dramatic vista. For smaller deep-sky objects like the Ring Nebula (M57) or the Hercules Cluster (M13), the wide field provides context, making the object feel suspended in a vast, dark sky.

    ED Glass in a 2-Inch Barrel: Maximizing Contrast and Color Fidelity

    This eyepiece uses Extra-Low Dispersion (ED) glass to virtually eliminate chromatic aberration, or false color fringing. This correction is critical at high magnifications, ensuring fine details on bright objects like the lunar terminator or Saturn's rings resolve with maximum sharpness and contrast. The result is a color-pure image, preserving the subtle hues of Jupiter's cloud bands and the true colors of double stars.

    High-Power Comfort: The 9mm ED's All-Weather Design

    Engineered for demanding field use, this 9mm eyepiece is fully waterproof and gas-purged. This process prevents internal optics from fogging during nights with heavy dew, protecting your investment and ensuring your views remain clear. The design also incorporates long eye relief, providing comfortable viewing during extended sessions and reducing eye strain when studying faint planetary details.

    ES 92° 9mm vs. TV 9mm Nagler: A 92° Field vs. an 82° Benchmark

    The Tele Vue 9mm Nagler is a long-standing benchmark for high-power, wide-field viewing, known for its sharp optics and compact form factor. The Explore Scientific 92° 9mm eyepiece, however, presents a compelling alternative with distinct advantages.

    • Wider Apparent Field: The primary difference is the Explore Scientific's 92° field compared to the Nagler's 82°. This extra 10 degrees creates a noticeably more immersive view.
    • All-Weather Construction: The waterproof and gas-purged design of the Explore Scientific eyepiece is a significant practical advantage for observers in humid climates, a feature not standard on the Nagler.
    • Trade-Offs: To achieve its ultra-wide field, the 92° eyepiece is physically larger than a Nagler. Both eyepieces represent a significant step up from standard Plössl or Kellner designs in both view quality and physical size.

  • How does the Explore Scientific 92° 9mm eyepiece perform on Jupiter with an 8" SCT?

    In a typical 8" f/10 SCT (2032mm focal length), the 9mm eyepiece yields 226x magnification. This is an ideal power for resolving fine details like the Cassini Division in Saturn's rings and intricate cloud bands on Jupiter. The 92° field of view will comfortably frame the planet and all four Galilean moons simultaneously.

    Is the 9mm focal length of this Explore Scientific eyepiece suitable for viewing the Ring Nebula (M57) in a 10" Dobsonian?

    Yes, it's an excellent choice. A 10" f/4.7 Dobsonian (1200mm focal length) would achieve 133x with this 9mm eyepiece. This magnification is high enough to show the central star within M57 on a good night, while the 92° field provides a dark, expansive backdrop that makes the nebula stand out.

    What is the main benefit of the 92° field of view on the Explore Scientific 9mm eyepiece?

    The primary benefit is the immersive, "spacewalk" feeling it creates, which makes observing more engaging. Practically, it keeps objects within the field of view for a longer time, especially on non-driven mounts like Dobsonians, reducing the need to constantly nudge the telescope at high power.

    What does the "ED" in the Explore Scientific 92° 9mm eyepiece mean for visual observing?

    ED stands for Extra-Low Dispersion glass. For the observer, this means the eyepiece corrects for chromatic aberration (false color). Views of high-contrast targets like the Moon, planets, and bright stars will be sharper, with higher contrast and no distracting purple or yellow color fringing around the edges.

    Is the Explore Scientific 92° 9mm eyepiece comfortable for observers who wear glasses?

    This eyepiece is designed with long eye relief, which allows you to hold your eye at a comfortable distance from the lens and still see the entire 92° field of view. This makes it significantly more comfortable for eyeglass wearers than eyepieces with short eye relief.

    Why is a waterproof eyepiece like the Explore Scientific 92° 9mm useful?

    Waterproofing is achieved by sealing the eyepiece and purging the air inside with an inert gas like argon or nitrogen. This prevents moisture, dew, and dust from getting inside the eyepiece barrel. It ensures the internal lens surfaces stay clean and prevents internal fogging on cold or humid nights.

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