Explore Scientific - 20mm 100° Series Nitrogen Purged Waterproof Eyepiece - 2"

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  • The Explore Scientific 20mm 100 Degree Nitrogen purged eyepiece boasts an ultra wide angle viewing experience with premium optics for exceptional clarity, contrast, and brightness.

  • A nitrogen purged interior keeps moisture, dust and mold away ensuring your Explore Scientific performs at it’s best for many, many years.

  • 14.5mm eye relief is comfortable for most viewers with or without glasses. 

  • 2” barrel is threaded to accept standard 2” filters and is notched for a secure fit in your focuser or diagonal.

  • Lifetime warranty!

SKU: EXP-EPWP10020-00
Manufactured by:
Explore Scientific

Product Description

WEExplore Scientific 20mm 100° Nitrogen Purged Waterproof Eyepiece - 2"

Explore Scientific was started with a singular goal, making the best possible astronomical gear at the best possible value.  Pushing the boundaries of wide field viewing experiences, the 100 degree Explore Scientific waterproof eyepieces will give you the feeling of travelling through space with a view so wide you don‘t notice the edges of the eyepiece at all.  Enjoy the benefits an ultra wide angle eyepiece and see the finer details of night sky objects by viewing not directly at but to the side of nebulae, star clusters and even the planets.  By having a wider field, your eye has the ability to pick those details out in the contrast of the night sky.  Fully multicoated optical glass, rigorous testing and top quality construction create an eyepiece that will last a lifetime.  Explore Scientific is willing to stand behind that with a lifetime warranty! 

Explore Scientific 20mm 100 Degree Eyepiece Features: 

  • Coatings: EMD™ (Enhanced Multilayer Deposition) Coatings
  • Eye Relief: 14.5mm
  • Field Stop Diameter: 34.8mm
  • Body: Anodized Black Aluminum; Laser-Etched Description and Serial Number; Rubber Grip: Internally O-Ring Sealed and Nitrogen Purged
  • Barrel: Stainless-Steel, 2-inch, Double Taper, Accepts Standard 2-inch Filters
  • Eyecup: Rubber Folding Type
  • Nitrogen-Purged and Waterproof: Internally sealed and purged with inert, dry nitrogen gas to prevent internal fogging, to halt the intrusion of fine particulates and fungus, and to maximize the life of the internal coatings. To make sure, each eyepiece is tested by submerging each unit in 1 meter of water for 30 minutes.
  • Coatings: All lens-to-air surfaces are fully multi-coated
  • Eyecups: Soft rubber folding style; Replaceable

Quality Control: Every Explore Scientific eyepiece is checked again and again both in the manufacturing facility in China and again in their facility in the USA to insure that each eyepiece will perform to its utmost. Inspiration for ultra-wide field eyepiece designs came from several designers. Wright H. Scidmore patented important ultra-wide angle eyepiece designs (one with long eye-relief) in the ‘60s for the U.S. government. His influence can be seen in many eyepiece designs on the market today with eyepieces of 68 to 80 degrees apparent field and more. Carl Zeiss made eyepieces of 110 and 120 degrees apparent field for use in U-boat periscopes before World War II. These are but two notable designers who developed ultra-wide field eyepieces over the decades. These eyepieces with their huge apparent field of view not only gave the observer a panoramic visual experience, but they relax the eye so the observer could pay attention to subtle details for extended periods. These ultra-wide angle eyepieces played a critical role in the military for aiming at targets, and their long eye-relief counterparts helped reduce eye injury from recoil. Years later such eyepiece designs transformed the visual experience for amateur astronomers, as they started using military surplus cannon sight eyepieces on their backyard telescopes. Later, commercial telescope companies such as Televue [3], Meade Instruments, Pentax, Celestron, and others made ultra-wide field eyepieces specifically for use in amateur telescopes. Since these extreme performance eyepieces are expensive to make, they come with a relatively high price tag over standard eyepieces. After announcing Explore Scientific's line of telescopes at the Astronomical League Conference in the summer of 2008, they decided to focus on ultra-wide angle eyepiece designs as well. Explore wanted to offer ultra-wide angle designs in popular formats at lower prices. Now more astronomers could experience the benefits of the panoramic views and would not feel too nervous about sharing the eyepiece during public outreach events, where sometimes an eyepiece becomes mishandled. It is sharing the amazing panoramic viewing experience with the public that is most important to Explore Scientific, as they feel that it will compel more people to become interested in astronomy and in science in general. Developing these eyepieces Explore Scientific wanted to take a fresh perspective and address several points. Their goal was to produce an ultra-wide angle design that provides pride of ownership at a great value.  

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.  A concept that has been applied to sporting optics for decades, the sealed, dry environment is impervious to internal fogging and contaminants such as fungus growing in between the lens elements. Explore Scientific waterproof eyepieces are 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 they test every eyepiece in one meter of water for 30 minutes.

Providing Peace of Mind - Explore Scientific stands behind their 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.


  •  EXPLORE SCIENTIFIC branded products are now under warranty forever, and this warranty is transferrable from owner-to-owner as long as the product is registered with EXPLORE SCIENTIFIC
  •  This Transferrable Unlimited Lifetime Warranty covers any problem no matter what the cause. In addition, this new warranty supersedes and is retroactive for EXPLORE SCIENTIFIC branded products that are already serving in the field, provided they are registered with us
  •  That means that no matter what the cause of the problem, no matter if you are the second or the 20th owner, we will take care of your EXPLORE SCIENTIFIC branded product without any repair or replacement fees.  For more info watch the following video by  Mr.Scott Roberts, Founder of Explore Scientific.




Name Explore Scientific - 20mm 100° Series Nitrogen Purged Waterproof Eyepiece - 2"
Manufacturer Explore Scientific
UPC 812257010745
Model EXP-EPWP10020-00
Manufacturer Part # EXP-EPWP10020-00
Apparent Field of View 100º
Eye Relief 14.5mm
Eyepiece Barrel Size 2"
Field Stop Diameter 34.8mm
Focal Length 20mm
Lens Coatings Fully Multi-Coated
Parfocal No
Warranty Explore Scientific STAR Lifetime Warranty (click to read more)
Weather Proof Yes


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