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Explore Scientific 68 Degree Waterproof Eyepiece
Explore Scientific 68 Degree Waterproof Eyepiece
Explore Scientific 68 Degree Waterproof Eyepiece
Explore Scientific 68 Degree Waterproof Eyepiece
Explore Scientific 68 Degree Waterproof Eyepiece
Explore Scientific 68 Degree Waterproof Eyepiece

Explore Scientific 68 Degree Waterproof Eyepiece

  • Vendor
    Explore Scientific
    Sale price
    Regular price
    Unit price
    Shipping calculated at checkout.


    Estimated Arrival: Between Jan 31 and Feb 06. *ETA to USA Only

    Shipping & Returns: Ships for free. Satisfaction guaranteed 30 day return policy.

    Using advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings, Explore Scientific 68° Series Argon-Purged Waterproof extreme wide field eyepieces are optimized to produce high contrast, high resolution, and superior flat field characteristics. The visual effect of these eyepieces with their long eye-relief and their 68° apparent field is truly a full-immersion experience. The 68° Series eyepieces are parfocal (meaning they focus at near the same point regardless of the focal length you select) and come with a removable and foldable soft silicone rubber eyecup for the comfort of the observer, and as experienced astronomers know, eye comfort is critical when trying to observe at the visual limits of the telescope.

    Protection from the Outdoors - by making the 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. Because Argon is less conductive of heat 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. This 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 every eyepiece is tested in one meter of water for 30 minutes.



    Item Number EPWP6816–01
    Focal Length 16mm
    Length 61.9mm
    Width 43.2mm
    Weight 5.5oz; 158g
    Barrel Size 1.25"
    Eye Relief 11.9mm
    Field Stop Diameter 18.2mm



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



    Item Number EPWP6824–01
    Focal Length 24mm
    Length 75.6mm
    Width 56.2mm
    Weight 11.6oz; 329g
    Barrel Size 1.25"
    Eye Relief 18.4mm
    Field Stop Diameter 27.2mm


    Item Number EPWP6828–01
    Focal Length 28mm
    Length 91.4mm
    Width 61.3mm
    Weight 16.1oz; 458g
    Barrel Size 2.00"
    Eye Relief 21.6mm
    Field Stop Diameter 31.8mm


    Item Number EPWP6834–01
    Focal Length 34mm
    Length 100.8mm
    Width 69.6mm
    Weight 24.1oz; 685g
    Barrel Size 2.00"
    Eye Relief 26.4mm
    Field Stop Diameter 38.6mm



    Item Number EPWP6840–01
    Focal Length 40mm
    Length 114.2mm
    Width 80.3mm
    Weight 35.2oz; 998g
    Barrel Size 2.00"
    Eye Relief 31mm
    Field Stop Diameter 45.5mm


    We know that once you've placed your order, you are anxious to receive it! We make every effort to get your order shipped out to you as quickly as possible.

    As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. We will process the charges to your credit card and your order will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at

    Standard shipping time in the US is between 3-5 business days, though it can vary slightly depending on the destination. We typically For updates on your shipment you can enter your tracking number here.

    We distribute nationwide via UPS and Fedex. Unfortunately, at this time we are not able to provide expedited or international shipping.  


    Returns & Refunds

    We have a 30-day return policy, which means that in the case that your order arrives broken or defective, or if you simply change your mind about your purchase, you have 30 days after receiving your item to request a return. Returns requested after 30 days of receiving your order will not be accepted. Refunds will be issued to the original credit card that you use when placing your order.

    To be eligible for a return, your item must be in the same condition that you received it. 

    To start a return, please contact us at to receive a prepaid return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted. 

    We will notify you once we’ve received and inspected your return and at this point, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

    You can always contact us for any return questions at