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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

Explore Scientific
Sale price
Regular price
$245.00 You save 10%
Unit price
Shipping calculated at checkout.


Estimated Arrival: Between Dec 11 and Dec 17. *ETA to USA Only

Shipping & Returns: 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.