Explore Scientific 9mm 120º 2" Argon Purged Waterproof Eyepiece

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Explore Scientific 9mm 120º 2" Argon Purged Waterproof Eyepiece
Item # ES-EPWP12009-01
  • The Explore Scientific 9mm 120º Eyepiece brings a never before seen super, ultra wide field of view and gives the feeling of being surrounded by the stars.
  • The eyepiece is waterproof and Argon-purged, and it comes with a replaceable soft, folding eyecup.
  • Eye relief on the Explore Scientific 9mm 120º Eyepiece is 13mm, the barrel is 2" and accepts 2" filters.


Explore Scientific 9mm 120º Eyepiece

Pushing the boundaries of eyepiece design, Explore Scientific spent years developing the 120 degree eyepiece, adding to it the bonus of an Argon purged interior space ensuring that your investment is immune to the outside environment and your eyepiece never falls victim to a damp night.

Though Carl Zeiss made eyepieces of 110 and 120 degrees apparent field for use in U-boat periscopes before World War II, eyepieces with this wide of a field of view have rarely been seen for astronomy use, particularly for the amateur market!

Like all Explore Scientific eyepieces, the lens elements of the 120° eyepiece are meticulously cleaned and aligned before being installed in their precision machined lens barrels.

Each lens and lens grouping have EMD (Enhanced Multilayer Deposition) Coatings and are edge-blackened to eliminate light scatter and maintain image contrast.

Contrast is further enhanced with baffles that mask and deflect unwanted stray light.

These eyepieces with their enormous apparent field of view give the ultimate panoramic experience and with such a wide field, your eye can truly relax and bring in even the faintest details.

Each 120° Series Argon-Purged Waterproof eyepiece is internally sealed and purged with inert, dry Argon gas to prevent internal fogging, to halt the intrusion of fine particulates and fungus, and to maximize the life of the internal coatings. 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 make sure, every 120° eyepiece is tested by submerging them down to 1 meter of water for 30 minutes. After announcing Explore Scientific’s line of telescopes at the Astronomical League Conference in the summer of 2008, they decided to focus on extreme performance, 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 amazing panoramic views these eyepieces provide.

Each and every Explore Scientific eyepiece is inspected both at the factory and again at our USA facility in California to ensure the highest degree of quality. Final visual and cosmetic inspections where the assembly integrity, cleanliness, and optical performance (including a test for visual image edge consistency) before shipping them to OPT.

Manufacturer Product Number: EPWP12009-01

Additional Information

Additional Information

SKU ES-EPWP12009-01
UPC Code 812257013876
Manufacturer Explore Scientific
Optical Design Wide Angle
Barrel Size 1.25"
Warranty Lifetime Warranty
Eyepiece Field of View - Apparent 120º
Eyepiece Focal Length 9mm
Eyepiece Eye Relief 13mm
Eyepiece Manufacturer Series Explore Scientific 120º Waterproof
Eyepiece Weight Not supplied by manufacturer
Field Stop Not supplied by manufacturer
Number of Lens Elements & Groups Not supplied by manufacturer
Special Feature Waterproof
Comes with Dust Caps? Yes
Comes with Eye Guard? Yes

Customer Reviews 1 item(s)

Immense FOV, chromatism
This ambitious eyepiece does not disappoint with its 120° field of view. Images are quite acceptable on axis when used on telescopes as fast as f/4.5. Contrast is fairly high. Towards the edges, lateral color is so pronounced that the spectral type of some objects can be determined (maybe an advantage after all?.
Incredible 'spacewalk' effect on star clusters and bright galaxies.
Not usable in daylight - when the eye's pupil is small, the whole FOV cannot be seen at once, and there are annoying, changing color hues across the FOV. Rather disappointing on the Moon for the same reason.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Dighaye c/o EurAstro / (Posted on 8/27/2012)
Included Items

Included Items

  • Explore Scientific 9mm 120º Eyepiece
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