For deep sky observers who demand exceptional clarity, contrast, and viewing comfort, the Explore Scientific 28mm 68° Series Eyepiece delivers an immersive wide-field experience that performs beautifully in rugged field conditions. Whether you're panning across the Milky Way or framing expansive nebulae and star clusters, this eyepiece brings celestial scenes to life with precision and ease.
Designed with a computer-optimized optical system, it features low-dispersion, high-refractive index glass enhanced with EMD (Enhanced Multi-Layer Deposition) coatings, offering crisp, high-contrast views and a well-corrected flat field across the entire 68° apparent field of view.
Its argon-purged, O-ring sealed waterproof housing protects the internal optics from fog, moisture, and dust, and is submersion-tested at 1 meter for 30 minutes to ensure durability under any sky.
The parfocal construction minimizes the need for refocusing when switching between eyepieces, and the 21.6mm eye relief with a removable soft silicone eyecup provides all-night comfort—even for eyeglass wearers.
CA Residents: Prop 65 WARNING(S)
🌟 Features & Benefits
- 28mm focal length with a 68° wide apparent field for panoramic celestial views
- Flat field design delivers sharp imagery edge-to-edge
- EMD-coated, low-dispersion optics enhance contrast and resolution
- Argon-purged, waterproof housing resists fogging and contamination
- 21.6mm eye relief ensures relaxed viewing, even with glasses
- Parfocal design allows seamless switching between focal lengths
- Submersion-tested waterproofing ensures rugged field reliability
- Flip-down silicone eyecup supports customizable eye placement
🎯 Who It’s For
- Deep sky explorers and visual astronomers looking for wide-field performance
- Eyeglass wearers needing extended eye relief
- Observers using Dobsonians, refractors, or SCTs for large-scale sky scans
🔭 What You’ll Be Able to See
- Expansive views of nebulae, galactic dust lanes, and the Milky Way
- Bright star clusters, open clusters, and galaxy groups
- Sweeping wide-field astrophotography framing (with proper adapters)
🎒 What’s Included
- Explore Scientific 28mm 68° Series Waterproof Eyepiece
- Protective end caps
- Soft drawstring pouch
Specs
| Item Number | EPWP6828–01 |
|---|---|
| Focal Length | 28mm |
| Apparent Field | 68° |
| Eye Relief | 21.6mm |
| Field Stop Diameter | 31.8mm |
| Barrel Size | 2.00" |
| Length | 91.4mm |
| Width | 61.3mm |
| Weight | 16.1 oz / 458g |
| 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