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Explore Scientific 2" 68° Series Argon-Purged Waterproof Eyepiece - 40mm

5.0 (1 Reviews) Read Reviews Write Review
Brand Explore Scientific
Part Number EPWP6840-01
Availability available

Product Info

Manufacturer Description

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, Explore Scientific has made 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. 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.

Explore Scientific's eyepieces are backed with their exclusive Explore STAR Transferrable Extended Life of the Product Warranty. Limited Warranty is one year, which converts to the Explore STAR Transferrable Extended Life of the Product Warranty when product is registered within 60 days of purchase. We think that you will find Explore Scientific eyepieces rank among the finest obtainable and represent an outstanding value.


5.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
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      User Notes:
      Review by Gustavo Sanchez of Isabela, Puerto Rico.
      Aug 14, 2015

      5.0 The best wide field eyepiece


      Strong Construction,Waterproof,Quality Lenses




      I started using eyeglasses and feared that I would not be able to use some of my eyepieces anymore. However, with eyeglasses on, this eyepiece is fantastic! Works wonderfully on my WO ZenithStar 71ED, ES AR152, and C8 SCT. I use it most on the 71mm, since it gives more than 6 degrees of FOV and makes it the best Milky Way scanner ever. It is a very heavy eyepiece, though, so make sure your focuser can handle it!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Apparent Field of View 68°
      Barrel Size 2" (50.8mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 85x120mm
      Coatings EMD (Enhanced Multilayer Deposition) Coatings
      Design 6 Elements; Combination of: Dense Crown, Light Crown, Dense Flint, and Lanthanum Optical Glasses
      End Caps 2
      Eye Relief by Design 31mm
      Filter Threads Standard 2" Filter Thread (M48 x 0.75)
      Focal Length 40mm
      Lens Elements 6
      Lens Groups 4
      Parfocal Yes
      Rubber Eye Guard Rubber Folding Type
      Blackened Lens Edges Yes
      Additional Information Body: Anodized Black Aluminum; Laser-Etched Description and Serial Number; Rubber Grip: Internally O-Ring Sealed and Argon Purged

      Barrel: Stainless-Steel, Double Taper, Accepts Standard Filters
      Manufacturer Explore Scientific
      Eyepiece Focal Length 30.1mm - 40mm
      Eyepiece Field of View 61 - 70 degrees
      Eyepiece Series Explore Scientific 68°
      Barrel Type Tapered barrel
      Eyepiece Weight 35oz (992.23g)