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Astronomy Haven Promo Alert: Buy any four in-stock premium waterproof eyepieces and get a free soft-sided eyepiece case from us!
To Activate Deal: Add four in-stock premium waterproof eyepieces to your cart. Upon confirming your order, we'll include this handy case in your shipment.
Grab it while our supplies last!

We love the Explore Scientific 52º Series Eyescopes! Crafted with precision, this 20mm waterproof eyepiece is ideal for amateur astronomers seeking unparalleled quality and versatility.
Perfectly suited to observe nebulae and galaxies, experience enhanced contrast and ease of use with averted vision and eye relief. What is averted vision? It is a game-changing technique for spotting faint celestial objects. By slightly shifting your gaze to either side, you'll unlock elusive details with astonishing clarity, making this eyepiece perfect for deep sky observation (even in suburban skies).
Its 20mm focal length on the Explore Scientific ED127 Essential Air-Spaced Triplet Refractor Telescope, produces a 1-degree true field of view, offering breathtaking perspectives of the cosmos. This is actually another big advantage of this type of eyepiece: it's generous wide field of view will grant you a truly immersive experience.
Another advantage that adds to its versatility is its compatibility with most binoviewers, making it a go-to choice for various observing setups. Plus, with its 1.25" barrel and textured design for slip-resistant grip, convenience is at your fingertips.
Engineered with an argon-purged, waterproof exterior, this eyepiece ensures long-lasting performance and effortless cleaning. Internal elements remain pristine, free from moisture damage, preserving their quality for years to come.
Discover more about the exceptional Explore Scientific Eyepieces on the Media Tab and get yours today!
Why choose the Explore Scientific 52° Series 20mm Waterproof Eyepiece?
1. Unmatched Craftsmanship and Adaptability
Impeccably crafted, this eyepiece boasts unmatched craftsmanship and adaptability, setting it apart as a top choice among amateur astronomers.
2. Enhanced Clarity and User-Friendly Design
Delight in enhanced clarity and user-friendly design features such as averted vision and comfortable eye relief. These innovative elements make spotting faint celestial objects a breeze, perfect for exploring the depths of nebulae and galaxies, even amidst light-polluted suburban settings.
3. Immersive Celestial Exploration
Revel in immersive celestial exploration with its 20mm focal length on the ED127 Series refractor from Explore Scientific, providing a sweeping 1-degree true field of view. Its expansive field of vision ensures every observation is a captivating journey through the cosmos.
4. Versatile Compatibility
Seamlessly integrate with most binoviewers, adding to its versatility and making it an essential component of various observing setups. Whether used with a telescope or binoviewers, this eyepiece delivers consistent performance and exceptional results.
5. Convenience Redefined
Experience unparalleled convenience with its 1.25" barrel and textured design for secure handling, ensuring comfort and control during extended observation sessions or while wearing gloves.
6. Longevity and Reliability
Engineered with an argon-purged, waterproof exterior, this eyepiece guarantees longevity and reliability. Its moisture-resistant construction safeguards internal components, preserving their quality for years of uninterrupted stargazing pleasure.
What's in the box?
- Explore Scientific 52° Series 20mm Waterproof Eyepiece ×1
- Dust Caps
SPECS
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Focal Length: 20mm
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Length: 71mm
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Weight: 43mm
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Weight: 6.4oz / 181.4g
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Barrel Size/Type: 1.25" O.D. / Double Taper
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Eye Relief: 15mm
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Field Stop Diameter: 18.2mm
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Coatings: EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
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Lens Elements/ Groups: 5 Elements in 3 Groups; Edge Blackened
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Filter Thread: Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
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Waterproof O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
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Eyecup Removable Flip-Down Style Soft Silicone Rubber
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Lens Caps Slide-on Top and Bottom
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Materials: Optical Glass; Aluminum; Steel; Silicone Rubber
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Markings: Laser Engraved: Focal Length; Series; Serial Number; Brand
CA Residents: Prop 65 WARNING(S)
MEDIA