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Item # EXP018
Explore Scientific 68 Degree Series Argon-Purged Waterproof Telescope Eyepieces
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Explore Scientific 68 Degree Series Argon-Purged Waterproof Telescope Eyepieces

Product Overview
  • Fully Waterproof and Argon Purged
  • 68 Degree Apparent Field of View
  • All internal surfaces/edges are flat black
  • EMD Enhanced Multilayer Deposition Coatings
  • Folding Rubber Eyecup

Product Information


  • Fully Waterproof and Argon Purged
  • 68 Degree Apparent Field of View
  • All internal surfaces/edges are flat black
  • EMD Enhanced Multilayer Deposition Coatings
  • Folding Rubber Eyecup


  • 16mm 1.25" 11.9mm Eye Relief 6 Elements in 4 Groups 5.5 oz.
  • 20mm 1.25" 15.3mm Eye Relief 6 Elements in 4 Groups 8.7 oz.
  • 24mm 1.25" 18.4mm Eye Relief 6 Elements in 4 Groups 11.6 oz.
  • 28mm 2.00" 21.6mm Eye Relief 6 Elements in 4 Groups 1 lb.
  • 34mm 2.00" 26.4mm Eye Relief 6 Elements in 4 Groups 1 lb. 8 oz.
  • 40mm 2.00" 31.0mm Eye Relief 6 Elements in 4 Groups 2 lb. 3 oz.



All 68° Series eyepieces are fully EMD (Enhanced Multi-Layer Deposition) coated and edge-blackened to produce superior contrast.

Through computer-optimized design, a careful selection of optical glasses, and enhanced multi-layer deposition coatings, the Explore Scientific 68° Series™ eyepieces produce long eye-relief and ensure high image-correction, a flat field, and high contrast across the entire image field. An excellent choice for those who make extended visual studies of detail with subtle variations of brightness, and for those who must wear glasses while observing.

With the introduction of the 68° Series we are pleased to make two important improvements in eyepiece manufacture, the first being 15 layer Enhanced Multi-layer Deposition (EMD™) coatings on all glass-to-air surfaces to gain maximum contrast, and waterproofing the eyepiece with the use of Argon gas purging instead of standard Nitrogen gas. Although Nitrogen is a fine choice that will last for many years, Argon is a larger molecule that maintains its protective properties over a wider range of temperatures, and is even more resistant to diffusion thereby further extending the protective waterproof environment of the eyepiece body.


Each eyepiece is meticulously assembled into precision machined metal lens barrels that maintain the perfect alignment of the optical train for years of rugged use in the field.The 82° Series eyepieces come with a twist-up rubber eye-guard that raise to the desired height 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.


To keep internal reflections to a minimum, all internal surfaces of the eyepiece barrel are flat black, as well as the edges of the lenses themselves to minimize the scattering of light within the lenses themselves.


In today's modern telescope industry there are many fine companies to choose from manufacturing top quality eyepieces. We invite direct side-by-side comparison with any other eyepiece of similar design, and we back our eyepieces with our exclusive Five Year Limited Warranty.* We think that you will find Explore Scientific eyepieces rank among the finest obtainable and represent an outstanding value.


Limited Warranty is one year, extended to five years when product is registered within 60 days of purchase.


Developing our new eyepieces we wanted to take a fresh perspective and address several points. Our goal was to produce an ultra-wide angle design that provides pride of ownership at a great value:

Focus on Value - We invite direct comparison to any eyepieces on the market in their category.

Protection from the Outdoors - By making the eyepiece body nitrogen-purged and waterproof eyepiece internal elements will remain as pristine as the day they were assembled. 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 insure a perfect seal we test every eyepiece in one meter of water for 30 minutes.

Creating an Identity - We look at purchasing fine optical equipment as an investment, and it should be treated as such. With a unique serial number on each eyepiece we can track when a product was made, and the owner can document their equipment for insurance and warranty purposes.

Providing Peace of Mind - Explore Scientific stands behind our products with a free 5 Year Transferrable Limited Warranty upon registration of the product. Want to trade or sell your eyepiece? You’ll get more value if its remaining warranty can be transferred to the new owner.

Technical Details



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