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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° 12mm Long Eye Relief Waterproof Eyepiece - 2"
Explore Scientific 92° 12mm Long Eye Relief Waterproof Eyepiece - 2"

Explore Scientific 92° 12mm Long Eye Relief Waterproof Eyepiece - 2"

by Explore Scientific
SKU ES-EPWP9212-01
$309.99 - $309.99
$309.99
$309.99 - $309.99
$309.99
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  • 12mm Focal Length
  • 92° Apparent Field of View
  • 2" Barrel Diameter
  • Long Eye Relief for Viewing Comfort
  • Argon-Purged Waterproof Construction
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  • Explore Scientific 92° 12mm Long Eye Relief Waterproof Eyepiece - 2"

    The Explore Scientific 92° 12mm Eyepiece redefines wide-field observing with its hyper-wide 92° apparent field of view. This 12mm ocular fits any 2-inch focuser, providing high power for detailed views of planets and small deep-sky objects.

    A 92° Hyper-Wide Apparent Field of View

    With an apparent field of view of 92°, this eyepiece delivers an immersive, 'spacewalk' experience that makes you feel like you're floating in the cosmos. This expansive view not only makes finding celestial objects easier but also keeps them in the field of view longer in non-driven telescopes like Dobsonians, reducing the need for constant nudging.

    The wide canvas is particularly effective for framing moderately sized objects like the Hercules Cluster (M13) or the Lagoon Nebula (M8) in their entirety. It also aids in the use of averted vision, allowing you to place faint targets on the more sensitive periphery of your retina to tease out subtle details.

    Long Eye Relief in a 12mm Design

    High-power, wide-field eyepieces often come with the trade-off of short, uncomfortable eye relief. Explore Scientific has engineered the 92° 12mm eyepiece with long eye relief, ensuring you can see the entire 92° field comfortably without pressing your eye against the lens. This is a critical feature for eyeglass wearers, who can observe with their glasses on and still take in the full, expansive view.

    A 2-Inch Waterproof Eyepiece: Argon-Purged for Longevity

    Designed for real-world observing conditions, the 92° 12mm eyepiece is fully waterproof. The optical housing is sealed and purged with inert argon gas, which prevents the formation of internal fogging during sudden temperature drops. This process also protects the internal lens coatings from moisture and fungus, ensuring the eyepiece delivers high-contrast views for years.

    Explore Scientific 92° vs. 82° Series: The Extra 10 Degrees

    While the 82° field of view has long been a standard for "ultra-wide" eyepieces, the 92° series pushes that boundary for a more profound sense of immersion. The key difference lies in the observational experience.

    • 82° Field of View: An 82° eyepiece provides a generous window into space, a significant step up from standard Plössls. It's a workhorse field of view that balances width with optical correction and cost.
    • 92° Field of View: The 92° field is so large that it can fill your eye's peripheral vision, creating the sensation of having no eyepiece at all. This "spacewalk" effect is what defines the 92° series, offering a more engaging and captivating view, especially on large, diffuse objects.

  • What objects are best for the Explore Scientific 92° 12mm eyepiece?

    The 12mm focal length provides medium-to-high magnification, making it ideal for resolving details in globular clusters like M13, observing planetary nebulae such as the Ring Nebula (M57), and framing smaller galaxies like the Whirlpool Galaxy (M51). In a telescope with a 2000mm focal length, it yields 167x magnification, perfect for planetary observing on nights of good seeing.

    How does the 92° field of view on the 12mm eyepiece help with a Dobsonian telescope?

    With a manual telescope like a Dobsonian, objects drift across the field of view due to Earth's rotation. The hyper-wide 92° field of the Explore Scientific 12mm eyepiece means an object will take significantly longer to drift from one side to the other compared to a standard eyepiece. This allows for longer, more relaxed observations at high power before you need to reposition the telescope.

    Can I use the Explore Scientific 92° 12mm eyepiece with eyeglasses?

    Yes. This eyepiece is specifically designed with long eye relief, a feature that allows eyeglass wearers to position their eye at a comfortable distance from the lens and still see the entire 92° apparent field of view. This makes it an excellent choice for observers with astigmatism.

    What does "Argon-Purged" mean for the Explore Scientific 12mm eyepiece?

    "Argon-Purged" means the interior of the eyepiece has been filled with inert argon gas and sealed. This process serves two purposes:

    • It prevents internal optics from fogging up when moving the eyepiece from a warm house to a cold outdoor environment.
    • It protects the delicate lens coatings from long-term degradation due to moisture, ensuring a lifetime of crisp, high-contrast views.

    Will I need a coma corrector with the 92° 12mm eyepiece in a fast Newtonian?

    In fast telescopes (f/5 or lower), hyper-wide eyepieces like the Explore Scientific 92° 12mm will reveal the coma inherent in the telescope's optics, causing stars at the edge of the field to appear elongated. For the sharpest possible views across the entire 92° field, using a high-quality coma corrector is strongly recommended.

    Why choose the Explore Scientific 92° 12mm eyepiece over a zoom eyepiece?

    While a zoom eyepiece offers convenience, a fixed focal length eyepiece like this 12mm model is optically simpler. This generally results in a wider apparent field of view (92° vs. typically 40°-60° in a zoom), better light transmission, and higher contrast, providing a more immersive and detailed image at its specific magnification.

  • Focal Length 12mm
    Apparent Field of View 92°
    Barrel Size 2"
    Eye Relief Long
    Waterproof Yes, Argon-Purged
    GTIN 812257017386

    • Explore Scientific 92° 12mm Eyepiece

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