The Explore Scientific 3mm 52° Series Eyepiece is built for high-power planetary, lunar, and double star observations, offering razor-sharp resolution and surprising comfort, even at extreme magnifications. Ideal for short focal length refractors or long focal length instruments seeking ultra-fine detail—all without a Barlow.
Delivering 160x on an ED80 f/6 or 405x on an ED152 f/8, this eyepiece provides the power to explore Jupiter’s atmospheric bands, Saturn’s Cassini Division, or the tightest double stars, while maintaining superb clarity across its 52° apparent field of view.
With 15mm of eye relief, fully multi-coated EMD optics, and a 6-element, 3-group design, this compact performer is also argon-purged and waterproof, ensuring lasting protection against internal fogging and environmental hazards.
CA Residents: Prop 65 WARNING(S)
🌟 Features & Benefits
- Ultra-short 3mm focal length ideal for lunar terrain, planetary detail, and double star splitting
- 52° apparent field of view offers immersive, distortion-free visuals
- 15mm eye relief provides rare comfort for such high magnification
- 6-element / 3-group optical layout delivers sharp focus and high contrast across the field
- Fully multi-coated EMD optics enhance light transmission and reduce reflections
- Edge-blackened lenses suppress stray light and boost image clarity
- Argon-purged, waterproof construction resists moisture, fogging, and dust
- Engraved barrel with focal length, serial number, and branding for long-term durability
- Standard 1.25” barrel with double taper for secure fit in most focusers and diagonals
- Flip-down soft silicone eyecup adds viewing comfort and ambient light blocking
- Slide-on lens caps included for safe storage and transport
🎯 Who It’s For
- Planetary and lunar observers who want to push their optics to the limit
- Refractor users seeking high magnification without needing a Barlow
- Astronomers who value waterproof protection and long-term durability
- Those looking for comfortable eye relief even at short focal lengths
🔭 What You’ll Be Able to See
- Crisp planetary details like Jupiter’s belts, Saturn’s rings, or Mars’ polar caps
- Lunar rilles, crater walls, and shadow transitions at maximum resolution
- Double stars, compact nebulae, or small globular clusters
- High-powered views using averted vision techniques for faint structure enhancement
🎒 What’s Included
- Explore Scientific 3mm 52° Series Waterproof Eyepiece
- Flip-down soft silicone eyecup
- Top and bottom dust caps
- Protective storage pouch
Specs
| Item Number | EPWP5203–01 |
|---|---|
| Focal Length | 3mm |
| Apparent Field of View | 52° |
| Eye Relief | 15mm |
| Field Stop Diameter | 2.7mm |
| Optical Elements / Groups | 6 Elements in 3 Groups |
| Lens Coatings | EMD (Enhanced Multi-Layer Deposition) |
| Barrel Size / Type | 1.25" O.D. / Double Taper |
| Filter Thread | Standard 1.25" (1.125" x 42 TPI) |
| Waterproofing | Argon Purged; O-Ring Sealed |
| Test Rating | Submerged 1 Meter for 30 Minutes |
| Eyecup | Removable Flip-Down Silicone Rubber |
| Length | 90.9mm |
| Width | 43mm |
| Weight | 204.1g (7.2 oz.) |
| Materials | Optical Glass, Aluminum, Steel, Rubber |
| Markings | Laser Engraved: Focal Length, Series, Serial Number, Brand |
Warranty Information
This product is covered by a Limited One-Year USA Warranty, valid when registered within 60 days of purchase. To activate your warranty, please visit the Explore Scientific website and complete the registration form at: