The Explore Scientific 68-Degree Eyepiece Kit includes a 16 mm, 24 mm, and 34 mm 68-Degree Argon-Purged Waterproof Eyepiece and a soft-sided case to ensure your eyepieces stay clean and safe. Each eyepiece is packaged individually in Explore Scientific’s iconic Will Tirion star map box and includes caps for both ends.

About Explore Scientific 68-Degree Eyepieces

Using advanced computer design, combinations of low dispersion and high refractive index optical glass, and durable multilayer deposition coatings Explore Scientific 68° Series™ Argon-Purged Waterproof 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 Explore 68° Series eyepieces 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.

By making the eyepiece body Argon-purged, the eyepiece’s 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. Explore Scientific’s waterproof eyepieces are easier to clean, and there is no risk of cleaning solution migrating from the top of the lens and seeping around the edges to be trapped in between elements. To ensure a perfect seal, Explore tests every eyepiece in one meter of water for 30 minutes.

• Focal Length - 16 mm
• AFOV - 68°
• Eye Relief - 11.9 mm
• Number of Elements - 6
• Argon-Purged and 100% Waterproof: Submersible to 1 meter for 30 minutes; Internally sealed and purged with inert, Argon gas to prevent internal fogging
• Body - Anodized Black Aluminum; Laser-Etched Description and Serial Number; Rubber Grip: Internally O-Ring Sealed
• Barrel - Stainless-Steel, 1.25", Accepts Standard 1.25" filters
• Coatings - All lens-to-air surfaces are fully multi-coated
• Eyecups - Soft rubber folding style; replaceable

• Focal Length - 24 mm
• AFOV - 68°
• Eye Relief - 18.4 mm
• Number of Elements - 6
• Argon-Purged and 100% Waterproof: Submersible to 1 meter for 30 minutes; Internally sealed and purged with inert, Argon gas to prevent internal fogging
• Body - Anodized Black Aluminum; Laser-Etched Description and Serial Number; Rubber Grip: Internally O-Ring Sealed
• Barrel - Stainless-Steel, 1.25", Accepts Standard 1.25" filters
• Coatings - All lens-to-air surfaces are fully multi-coated
• Eyecups - Soft rubber folding style; replaceable

• Focal Length - 34 mm
• AFOV - 68°
• Eye Relief - 26.4 mm
• Number of Elements - 6
• Argon-Purged and 100% Waterproof: Submersible to 1 meter for 30 minutes; Internally sealed and purged with inert, Argon gas to prevent internal fogging
• Body - Anodized Black Aluminum; Laser-Etched Description and Serial Number; Rubber Grip: Internally O-Ring Sealed
• Barrel - Stainless-Steel, 2", Accepts Standard 2" filters
• Coatings - All lens-to-air surfaces are fully multi-coated
• Eyecups - Soft rubber folding style; replaceable

All Explore Scientific telescope accessories are covered under their standard U.S.A. One Year Limited Warranty against defects with proof of purchase, but you can extend this limited warranty to five years by simply filling out the product registration and submit it to Explore Scientific within 60 days. This program is also available to the person who receives your gift of an Explore Scientific telescope. You don't need to give them the purchase receipt, just remind them to fill out the registration and submit it to Explore Scientific and they will take care of the rest.