Built for immersive stargazing and long-lasting reliability, the Explore Scientific 20mm 68° Series Eyepiece offers vivid clarity, true flat-field performance, and comfortable viewing for visual astronomers of all levels. Whether you're scanning expansive star fields or zeroing in on nebulae, this eyepiece delivers rich, high-contrast views with edge-to-edge sharpness.
Engineered with a computer-optimized optical system, the 20mm eyepiece features low-dispersion, high refractive index glass and EMD (Enhanced Multi-Layer Deposition) coatings to maximize light transmission and reveal subtle celestial detail. The 68° apparent field of view offers a spacious, immersive experience perfect for deep sky targets.
Housed in a rugged, waterproof aluminum body that’s argon-purged and O-ring sealed, this eyepiece resists internal fogging, dust, fungal growth, and thermal variation. Each unit is submersion-tested for 30 minutes at 1 meter, ensuring complete environmental sealing.
With its parfocal design, you can swap eyepieces with minimal refocusing, while the 15.3mm eye relief and fold-down silicone rubber eyecup provide viewing comfort for eyeglass wearers and extended observation sessions.
CA Residents: Prop 65 WARNING(S)
🌟 Features & Benefits
- 20mm focal length delivers ideal mid-range magnification for wide-sky exploration
- 68° apparent field of view for immersive, panoramic stargazing
- Flat-field optics provide consistent edge-to-edge sharpness
- Low-dispersion, high-index glass with EMD coatings for maximum contrast and brightness
- Parfocal build allows seamless eyepiece transitions without major refocusing
- Argon-purged, waterproof construction resists internal fog, moisture, and fungal contamination
- 15.3mm eye relief with fold-down silicone eyecup ensures comfort for all observers
- Tested waterproof by submersion at 1 meter for 30 minutes
🎯 Who It’s For
- Visual astronomers seeking a sharp, mid-power eyepiece
- Observers who use refractors, SCTs, or Dobsonian telescopes
- Eyeglass wearers needing long eye relief for extended sessions
🔭 What You’ll Be Able to See
- Sweeping views of star clusters, nebulae, and bright galaxies
- High-contrast detail in open fields and structured deep sky regions
- Smooth panning across the Milky Way with minimal distortion
🎒 What’s Included
- Explore Scientific 20mm 68° Series Waterproof Eyepiece
- Protective end caps
- Soft storage pouch
Specs
| Item Number | EPWP6820–01 |
|---|---|
| Focal Length | 20mm |
| Apparent Field | 68° |
| Eye Relief | 15.3mm |
| Field Stop Diameter | 22.8mm |
| Barrel Size | 1.25" |
| Length | 69.6mm |
| Width | 50.3mm |
| Weight | 8.7 oz / 247 g |
| Waterproofing | Argon Purged / O-Ring Sealed |
| Eyecup | Removable Flip-Down Silicone Rubber |
Warranty Information:
This product includes a Limited One-Year USA Warranty, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when registered within 60 days of purchase.
To activate your warranty, register your product at:
www.explorescientific.com/pages/product-registration