Skip to content

Explore Scientific 68° Series 20mm Waterproof Eyepiece

SKU EPWP6820-01
Original price $0.00 - Original price $0.00
Original price $0.00
$219.99 - $219.99
Current price $219.99
In stock

Ships To: United States & Canada 🇺🇸 🇨🇦

✓ Free U.S. Shipping (on most orders over $150 USD)

✓ Price Match Available

✓ Authorized Dealer

✓ Bulk Order Discounts Available

✓ Questions? Call Us 1-800-860-3429

Ships In: 1-3 Business Days

Estimated Delivery Time: 3-7 Business Days

Shipping & Returns

We offer free U.S. shipping to the lower 48 States - on most orders over $150 USD. Some limitations apply.

Shipping fees will apply on most orders shipping across Canada, with some exceptions.

We offer a 30 Day Return Policy on most of the products that we carry.

For full details on our Shipping & Returns Policy, please click here.


The vast majority of products that we sell, with a few exceptions, are covered under Warranty.

To view the Warranty details for each brand that we sell, including products that do not qualify for Warranty, please visit here.

Explore Scientific 68 Degree Series 20mm Waterproof Eyepiece - EPWP6820-01

Presenting the Explore Scientific 68° Series 20mm Waterproof Eyepiece.

Enhanced with robust multilayer deposition coatings, this Eyepiece delivers unrivalled contrast, resolution, and a remarkably flat field.

With an expansive 68° apparent field and generous eye relief, they offer an immersive viewing experience.

Designed to be parfocal across various focal lengths, they also feature a removable, foldable silicone rubber eyecup for observer comfort.

Seasoned astronomers understand the crucial role eye comfort plays when pushing the boundaries of visual observation with a telescope.

Crafted for Outdoor Resilience, the eyepiece body is Argon-purged, ensuring the internal elements remain as pristine as the day they were assembled.

Argon, with its larger atomic size compared to Nitrogen, provides a superior seal that minimizes leakage and diffusion over the eyepiece's lifespan.

Its inert nature prevents unwanted reactions with eyepiece components, extending their longevity and protecting against chemical interactions with potential contaminants.

Explore Scientific 62° Series Waterproof Eyepiece

Additionally, Argon's lower thermal conductivity means it absorbs heat at a slower rate, buffering against rapid temperature changes in the optics.

This sealed environment effectively prevents internal fogging and the growth of contaminants like fungus between lens elements.

Cleaning is a breeze, without the risk of cleaning solution seeping between elements. To ensure an impeccable seal, each eyepiece undergoes rigorous testing in one meter of water for 30 minutes.

Elevate your stargazing experience with the Explore Scientific 68° Series 20mm Waterproof Eyepiece.



  • 68° Field of View: With an expansive 68° apparent field of view, this eyepiece provides a wide, immersive perspective of the night sky. This wide field of view is particularly beneficial for observing large celestial objects and capturing panoramic views of celestial landscapes.
  • 20mm Focal Length: The eyepiece offers a focal length of 20mm, providing a versatile viewing experience suitable for a wide range of celestial objects and astronomical observations.
  • Advanced Optical Design: Utilizing cutting-edge computer design, the eyepiece incorporates a combination of low dispersion and high refractive index optical glasses. This ensures exceptional image quality with minimized chromatic aberration and improved color fidelity.
  • Durable Multilayer Deposition Coatings: The eyepiece is equipped with robust multilayer deposition coatings. These coatings enhance light transmission, reduce internal reflections, and optimize contrast, resulting in clear, crisp views.
  • Argon-Purged for Waterproofing: The eyepiece is Argon-purged, creating a sealed environment that effectively protects the internal elements from environmental factors. This ensures that the eyepiece remains free from fogging, even in damp conditions.
  • High Contrast and Resolution: The eyepiece is optimized to deliver high contrast and resolution, allowing for detailed observations of celestial objects. This feature is essential for discerning fine details on the lunar surface, planets, and deep-sky objects.
  • Superior Flat Field Characteristics: The eyepiece is designed to maintain excellent flat field characteristics, ensuring 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: The eyepiece offers generous eye relief, providing comfort for extended viewing sessions. This feature is especially appreciated by observers who wear eyeglasses, as it allows for comfortable viewing without the need for excessive eye strain.
  • Parfocal Design: The eyepiece maintains focus at near the same point regardless of the focal length selected. This parfocal design streamlines the observing process, allowing for smooth transitions between different eyepieces without the need for frequent refocusing.
  • Removable and Foldable Soft Silicone Rubber Eyecup: The eyepiece includes a removable and foldable soft silicone rubber eyecup, enhancing comfort during extended observing sessions. This feature provides 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, thereby extending the lifespan of internal elements.
  • Resilience to Temperature Changes: Argon's lower thermal conductivity ensures slower heat absorption, which helps buffer against rapid temperature fluctuations. This feature helps maintain stable optical performance, even 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 package encompasses eyepiece caps for protective covering, soft silicone rubber eyecups for comfortable use, an eyepiece pouch/case for secure storage, and comes with a limited 1-year warranty for added peace of mind.


                                                        What's Included:

                                                        ✓ Explore Scientific 68° Series 20mm Waterproof Eyepiece

                                                        ✓ Eyepiece Caps

                                                        ✓ Soft Silicone Rubber Eyecups

                                                        ✓ Eyepiece Pouch/Case

                                                        ✓ Limited 1 year warranty



                                                                Item Number  EPWP6820–01
                                                                Focal Length  20mm
                                                                Length  69.6mm
                                                                Width  50.3mm
                                                                Weight  8.7oz; 247g
                                                                Barrel Size  1.25"
                                                                Eye Relief  15.3mm
                                                                Field Stop Diameter  22.8mm

                                                                Customer Reviews

                                                                Be the first to write a review