Explore Scientific 28mm 68° Argon-Purged Waterproof Eyepiece - EPWP6828-01

No Ratings Yet

Write a Review

Item #EXPL-EPWP6828-01

  • Your Price:
  • $299.99
  • + FREE Shipping

Leave us your email, and we’ll let you know when this item is back in stock.

  • The Explore Scientific 28mm Argon-Purged Eyepiece is waterproof and ready for your next adventure
  • 68º apparent field of view
  • Housed in a 2" barrel
Questions? Let our experts help!
  • Description

    Explore Scientific 28 mm 68º Waterproof Eyepiece - 2"

    The Explore Scientific 28 mm 68º Series™ eyepiece is an excellent multi-element flat-field eyepiece that will revolutionize your experience with visual astronomy. This ocular is an amazing value and packed with features such as a 68-degree apparent field of view and a close to parfocal design. Enjoy a fully immersive experience with generous eye relief and high-contrast, high-resolution views with this 68º Series eyepiece.

    By making this Explore Scientific eyepiece body Argon-purged, the waterproof eyepiece internal elements will remain as pristine as the day they were assembled. Argon atoms are “ larger” than that of Nitrogen and therefore they are less likely to “leak” or diffuse their way through the seals over the life of the eyepiece. The atomic radius of Argon is larger than Nitrogen by 0.13 angstroms and has a larger atomic volume by 11.2 cubic centimeters/molecule. Argon also has superior inertness vs Nitrogen (i.e. forming few or no chemical compounds with other elements) that prevents adverse reactions with eyepiece components and therefore extends the longevity of the internal components, and also prevents chemical reactions with other elemental contaminants that may be introduced through a weakened seal. And, finally, because Argon is less conductive than Nitrogen, Argon cools slower thereby buffering the effects of rapid temperature changes of the optics. The sealed, dry environment is impervious to internal fogging and contaminants such as fungus growing in between the lens elements. Our waterproof eyepiece is easier to clean, and there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements. To ensure a perfect seal, Explore tests every eyepiece in one meter of water for 30 minutes.


    Supplier SKU


    What's Included

    • Explore Scientific 28 mm - 68° Argon-Purged Waterproof 2" Eyepiece
    • Rubber Eyecups
    • Dust Caps

  • Dimensions & Specifications

    • Focal Length: 28 mm

    • Field of View: 68º
    • Length: 91.4 mm
    • Eye Relief: 21.6 mm
    • Field Stop Diameter: 31.8 mm
    • Waterproof: Yes
    • Barrel Size: 2"
    • Coatings: Fully Multi-Coated
    • Weight: 16.1 oz.

  • Product Guarantee

    We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.

    Manufacturer Warranty

    Limited Warranty is one year, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when product is registered within 60 days of purchase.

    Return & Exchange Policy

    At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.

  • Stars


    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars

    Most Helpful Reviews

    Most Critical Reviews

    All Reviews

    Displaying Reviews 1-10 of