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Explore Scientific 82° Series 11mm Waterproof Eyepiece

SKU EPWP8211-01
Original price $0.00 - Original price $0.00
Original price $0.00
$229.99 - $229.99
Current price $229.99
In stock

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Explore Scientific 82 Degree Series 11mm Waterproof Eyepiece - EPWP8211-01

Presenting the Explore Scientific 82° Series 11mm Waterproof Eyepiece.

The 82° Series 11mm Waterproof Argon-Purged Eyepiece offers a sought-after focal length in the upper-medium power magnification category, providing an expansive apparent field and generous eye relief.

It excels in applications where increased power is desired, making it perfect for observing globular star clusters, planetary nebulae, and more.

With proper filtration, it enables observations of the sun's active regions.

Pair it with Explore Scientific Focal Extenders for additional magnification while preserving the eyepiece's wide field and eye relief.

This eyepiece is crafted using advanced computer design, incorporating low dispersion and high refractive index optical glasses, along with durable enhanced multilayer deposition (EMD) coatings.

This optimization results in exceptional contrast, resolution, and a flat field.

The combination of long eye relief and an 82° apparent field provides a fully immersive experience, allowing for relaxed viewing and the effective use of averted vision to discern faint details across a vast field of view.

Explore Scientific 82° Series Waterproof Eyepiece

Precision machined metal lens barrels ensure the perfect alignment of the optical components, guaranteeing years of reliable use. Internal surfaces and lens edges are meticulously treated to minimize reflections and scatter, enhancing overall image quality.

Explore Scientific 82° Series 11mm Waterproof eyepiece offer not only a wide apparent field but also an immersive viewing experience that encourages relaxation at the eyepiece.

This relaxed viewing approach enables extended observation sessions, unveiling intricate details that might have been initially overlooked.

Additionally, these eyepieces facilitate the use of averted vision, enhancing the visibility of faint objects by directing light to the more light-sensitive part of the eye.



  • 82° Apparent Field of View: A remarkably wide apparent field of view, offering an immersive and expansive perspective of celestial objects. This wide field of view enhances the observation of large celestial structures and allows users to capture sweeping views of the night sky in a single frame.
  • 11mm Focal Length: With a 11mm focal length, this eyepiece falls into the upper-medium power magnification category, making it versatile for various astronomical observations. It is well-suited for observing globular star clusters, planetary nebulae, comet nuclei's cloud structures, and initial planetary observations. It also allows for solar observations with the proper solar filtration.
  • Advanced Optical Design: This eyepiece employs advanced computer-aided design and incorporates a combination of low dispersion and high refractive index optical glasses. This optical design minimizes chromatic aberration, enhances color fidelity, and ensures exceptional image quality.
  • Durable Multilayer Deposition Coatings: The eyepiece features robust multilayer deposition coatings on each lens surface. These coatings are designed to optimize light transmission, reduce internal reflections, and maximize contrast, resulting in exceptionally clear and crisp views of celestial objects.
  • Argon-Purged Waterproof Design: Crafted with an Argon-purged, waterproof construction, this eyepiece is built to withstand various environmental conditions. The Argon gas filling creates a sealed environment that effectively prevents internal fogging and safeguards the optical elements from contaminants, ensuring consistent performance over time.
  • High Contrast and Resolution: The eyepiece is optimized to deliver high contrast and resolution, which is essential for detailed observations of celestial objects. It excels in revealing fine details on planetary surfaces, the lunar landscape, and deep-sky objects.
  • Superior Flat Field Characteristics: Designed to maintain excellent flat field characteristics, this eyepiece ensures that stars remain sharp and pinpoint across the entire field of view. This feature is particularly valuable for astrophotography and detailed visual observations.
  • Long Eye Relief: Offering generous eye relief, this eyepiece provides a comfortable viewing experience, even during extended observation sessions. The extended eye relief is especially appreciated by observers who wear eyeglasses, as it allows for comfortable viewing without excessive eye strain.
  • Parfocal Design: The eyepiece maintains focus near the same point across various focal lengths, allowing for smooth transitions between different eyepieces without frequent refocusing.
  • Removable and Foldable Soft Silicone Rubber Eyecup: Included with the eyepiece is a removable and foldable soft silicone rubber eyecup, enhancing comfort during extended observing sessions. This eyecup acts as a cushioned interface between the observer's eye and the eyepiece, reducing fatigue.
  • Argon vs. Nitrogen Purging: Argon gas, being larger than Nitrogen atoms, offers enhanced sealing properties, minimizing the risk of leakage over time. Additionally, Argon's inert nature prevents adverse reactions with eyepiece components, extending the lifespan of internal elements.
  • Resilience to Temperature Changes: Argon's lower thermal conductivity ensures slower heat absorption, buffering against rapid temperature fluctuations in the optics. This feature helps maintain stable optical performance in environments with varying temperatures.
  • Rigorous Water Testing: Each eyepiece undergoes thorough testing in one meter of water for 30 minutes to ensure a perfect seal, providing added confidence in its waterproofing capabilities.
  • Included Accessories: The accessory ensemble accompanying the Explore Scientific 82° Series 11mm Waterproof Eyepiece includes protective eyepiece caps, comfortable soft silicone rubber eyecups, a secure eyepiece pouch/case for storage, and is complemented by a limited 1-year warranty, ensuring heightened peace of mind for users.

                                                                Explore Scientific Eyepiece Guide Video:


                                                                What's Included:

                                                                ✓ Explore Scientific 82° Series 11mm Waterproof Eyepiece

                                                                ✓ Eyepiece Caps

                                                                ✓ Soft Silicone Rubber Eyecups

                                                                ✓ Eyepiece Pouch/Case

                                                                ✓ Limited 1 year warranty



                                                                Item Number  EPWP8211–01
                                                                Focal Length  11mm
                                                                Length  87mm
                                                                Width  48mm
                                                                Weight  9.8oz; 279g
                                                                Barrel Size  1.25"
                                                                Eye Relief  15.6mm
                                                                Field Stop Diameter  15.9mm

                                                                Customer Reviews

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