Explore Scientific 11mm 82 Degree Waterproof Eyepiece - 1.25-Inch

  • Focal Length: 11 mm
  • FoV: 82 Degrees
  • Barrel Size: 1.25-inch
  • Excellent wide field eyepiece for observing use
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  • Regular price $199.99

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Explore Scientific 11mm 82 Degree Waterproof Eyepiece - 1.25-Inch

Using advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings, Explore Scientific 82 degree Series extreme wide field eyepieces are optimized to produce high contrast, high resolution, and superior flat field characteristics. Each 82 degree Series Nitrogen-Purged Waterproof eyepiece is 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.

The visual effect of these eyepieces with their long eye-relief and their 82 degree apparent field is truly a full-immersion experience. Your eye is relaxed, allowing you to easily use the "averted vision" technique to study faint details across a huge field-of-view. 

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 degree 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. Explore Scientific invites direct side-by-side comparison with any other eyepiece of similar design, and they back their eyepieces with a Lifetime Warranty. We think that you will find Explore Scientific eyepieces rank among the finest obtainable and represent an outstanding value.

OPT Product Number: ES-EPWP8211-01


Dust Caps IncludedYes
Eye Guard IncludedYes
Eye Relief15mm
Eyepiece Special FeatureWaterproof
Field of View82 degrees
Focal Length11mm
Free ShippingYes
Lens Elements & Groups7 elements & 4 groups
ManufacturerExplore Scientific
ModelExplore Scientific 82 degree Waterproof
Optical DesignWide Angle
WarrantyLifetime Warranty


  • Eyepiece
  • Eyepiece Dust Cap
Customer Reviews
4.0 Based on 2 Reviews
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Mind Blowing Performance

This eyepiece is $159.00....$159.00... I still can't get over it! The view through this EP in my ED127 triplet is nothing short of incredible. Pinpoint Stars. that "porthole view" is something that takes a little getting used to but the stars are sharp right out to the field stop (if you can find it!). I have Televue's and they are excellent, but to be honest, this is every bit as good and possibly a tad better than my TV's! (I know it's heretical, but this eyepiece allowed my wife to see the Cassini division for the first time without using averted vision. Coupled with a ES 3X focal extender this is a powerhouse. HIGHLY RECOMMENDED.

kevin z.
first look

you want it to be a nagler type 6 clone but it isn't. the real-world eye-relief is nothing close to the claimed 15 mm. its much less than that of a comparable type 6 (I compared to 13 and 9 mm, at least not if you want to see much of the field. It reminds me of a short focal length orthoscopic. not a comfortable eyepiece to use. Its also notably heavier. but its not bad (I've seen bad if you compare its price to the nagler you are getting what you paid for.