Buy one, get one 25% off - Alpen Optics

Explore Scientific  |  SKU: EPWP8245LE-01

Explore Scientific 82° Series 1.25" 4.5mm LER Waterproof Eyepiece

$269.99 $323.99

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

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Explore Scientific 82° Series 1.25" 4.5mm LER Waterproof Eyepiece



  • 4.5mm Focal Length
  • 82° Field of View
  • 1.25" 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


Elevate Your Astronomical Observations

Dive into the universe with the Explore Scientific 82° Series 1.25" 4.5mm LER Waterproof Eyepiece, a pinnacle of optical engineering designed for avid stargazers seeking clarity, comfort, and precision. Experience the moon's craters, the dance of binary stars, and the intricate textures of distant nebulae like never before.

  • High Magnification 4.5mm Focal Length: Unlock stunning details of celestial objects, offering a close-up view that's perfect for lunar landscapes, planetary exploration, and binary star systems.
  • Ultra-Wide 82° Apparent Field of View: Immerse yourself in a vast expanse of the night sky, allowing for longer, more comfortable observation sessions without the need to reposition.
  • Exceptional Long Eye Relief (15.9mm): Designed with eyeglass wearers in mind, this feature ensures everyone can enjoy the full panorama without compromising comfort or field of view.
  • Advanced Optical Quality: Boasts EMD fully multi-coated optics and edge-blackened lenses crafted from low-dispersion glass, ensuring peak light transmission, contrast, and resolution.
  • Durable, User-Friendly Design: Argon-filled and waterproof for protection against the elements, paired with a slip-resistant textured surface and fold-down eyecup for ease of use.

Designed for Discovery

Whether you're tracing the jagged edge of the lunar surface or diving into the heart of a glowing nebula, the 4.5mm LER Eyepiece is your guide to the cosmos. Its precise focal length and superior optics reveal the universe in stunning clarity and detail, even in less-than-ideal atmospheric conditions.

A View That Draws You In

Experience a viewing journey that's not just about seeing but exploring. The eyepiece's broad field encourages the use of averted vision, enhancing your ability to perceive faint celestial wonders by utilizing the more light-sensitive parts of your eye. This technique, coupled with the eyepiece's immersive field of view, brings the depths of space into sharper focus.

Built for the Elements

Rigorous construction ensures each eyepiece stands up to the rigors of field use. Gas-purged and O-ring sealed, it resists internal fogging and keeps contaminants at bay, making maintenance simple and ensuring the longevity of your investment.

Explore the Unseen

The Explore Scientific 82° Series 4.5mm LER Eyepiece is more than just a tool; it's a portal to the universe's soul, designed to bring the wonders of the night sky to your eyes with unparalleled clarity and comfort. Embark on your celestial journey with confidence, knowing every detail has been engineered for excellence.

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Explore Scientific 82° Series 1.25" 4.5mm LER Waterproof Eyepiece | EPWP8245LE-01 | 811803030213

Explore Scientific 82° Series 1.25" 4.5mm LER Waterproof Eyepiece

$269.99 $323.99





Focal Length

4.5 mm

Focal Ratio


Field of View



Enhanced multi-layer deposition (EMD) coatings

Argon-purged, water and fog proof

15.9mm eye relief

Barrel Size



106mm length

50mm width


275 g | 9.7 oz
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