Buy one, get one 25% off - Alpen Optics

Explore Scientific  |  SKU: EPWP8218–01

Explore Scientific 82° Series 2" 18mm Waterproof Eyepiece

$319.99 $383.99

Bonus offer: after adding this item to cart, add 3 other eyepieces + the soft-sided case to get it for Free ($49.99 value)

Estimated delivery in 3-5 business days via UPS or FedEx

Ships from US warehouse in 1-2 business days

Shipping & Returns

We offer free US standard shipping on orders over $99 and 30-day returns on most items. Some limitations apply.

Shipping Policy

30-Day Return Policy

Explore Scientific 82° Series 2" 18mm Waterproof Eyepiece



  • 18mm Focal Length
  • 82° Field of View
  • 2" Diameter Barrel
  • Parfocal with All Eyepieces in Series
  • Long Eye Relief for Maximum Comfort
  • EMD Fully Multi-Coated Optics
  • Blackened Interior & Lens Edges
  • Argon Filled, Water and Fogproof
  • Slip-Resistant Textured Surface
  • Fold-Down Eyecup


Embark on a Stellar Journey with Unmatched Clarity and Comfort

The Explore Scientific 82° Series 2" 18mm Waterproof Eyepiece is engineered for the discerning astronomer who values both a wide field of view and high magnification. This eyepiece is your telescope's perfect partner for delving into the cosmos, offering a super-wide apparent field that brings the majesty of the night sky right before your eyes.

  • Versatile 18mm Focal Length: Ideal for a broad spectrum of observational interests, from the detailed craters of the Moon to the sprawling expanse of globular star clusters and the intricate structures of nebulae.
  • Expansive 82° Apparent Field of View: Experience the cosmos with an immersive viewing field that captivates your vision and enhances your ability to track celestial phenomena without constant readjustment.
  • Exceptional Optical Quality: Utilizing low dispersion and high refractive index optical glasses, coated with EMD for enhanced light transmission, this eyepiece delivers sharp contrast, high resolution, and a flat field of view.
  • Designed for Durability and Ease: Argon-filled, waterproof, and fogproof, it stands up to any viewing condition. The precision machined metal barrel ensures long-term alignment of the optics, while the slip-resistant surface and fold-down eyecup enhance comfort and usability.

A Truly Immersive Observational Experience

With the Explore Scientific 18mm Eyepiece, you're not just observing; you're part of the celestial landscape. The ultra-wide field of view and long eye relief provide a comfortable and engaging experience, encouraging longer observation sessions and the discovery of subtle details that may escape initial notice.

Master the Art of Averted Vision

Enhance your observational capability with the technique of averted vision, made effortless by this eyepiece's wide field. By looking slightly to the side of your target, you engage the more light-sensitive parts of your eye, revealing faint objects with surprising clarity.

A Trustworthy Companion for Your Astronomical Ventures

Built to accommodate the rigors of field use, this eyepiece is not just a tool but a trusted companion for your explorations of the night sky. Whether you're an experienced astronomer or embarking on your first celestial journey, the Explore Scientific 82° Series Eyepiece promises to transform your viewing experience, making every night at the telescope an adventure to remember.

Use with Explore Scientific Focal Extenders for 2X, 3X, or 5X magnification increases while maintaining the eyepiece native apparent field and eye relief.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Meta Pay
  • Google Pay
  • Mastercard
  • Shop Pay
  • Visa

Your payment information is processed securely encrypted during transmission. We do not store credit card details nor have access to your credit card information.

Questions & Answers

Have a Question?

Be the first to ask a question about this.

Ask a Question
Explore Scientific 82° Series 2" 18mm Waterproof Eyepiece | EPWP8218–01 | 812257014620

Explore Scientific 82° Series 2" 18mm Waterproof Eyepiece

$319.99 $383.99





Focal Length

18 mm

Focal Ratio


Field of View



Enhanced multi-layer deposition (EMD) coatings

Argon-purged, water and fog proof

13mm eye relief

25.3mm field stop diameter

Barrel Size



89mm length

56mm width


390 g | 13.7 oz
View product