The Explore Scientific 4.5mm 52° Series Eyepiece is a favorite among astronomers who crave high-power magnification without compromising comfort or clarity. Perfect for planetary and lunar detail, double star splitting, and compact deep-sky targets, this eyepiece unlocks your telescope’s true resolution under steady skies.
With 15mm of eye relief, it provides a surprisingly comfortable viewing experience at such a short focal length—making it usable even during extended sessions or by eyeglass wearers. The 52° apparent field of view offers a flat, immersive image that keeps celestial targets centered and defined.
Engineered with 6 precision lens elements in 3 groups, edge-blackened optics, and EMD coatings, this waterproof eyepiece delivers crisp contrast, minimal glare, and enhanced light throughput. Its argon-purged sealed body keeps internal lenses fog-free and protected from environmental hazards, ensuring years of reliable performance.
CA Residents: Prop 65 WARNING(S)
🌟 Features & Benefits
- 4.5mm focal length provides powerful high magnification for the Moon, planets, double stars, and compact deep sky objects
- 52° apparent field of view creates an engaging and natural-feeling visual space
- 15mm eye relief offers rare comfort at this high magnification, ideal for long sessions or eyeglass wearers
- 6-element / 3-group design ensures high clarity and minimal distortion across the field
- Fully multi-coated optics with EMD coatings for enhanced contrast and light transmission
- Edge-blackened lenses reduce internal reflections for better image sharpness
- Argon-purged and waterproof housing prevents fog, moisture, and dust from affecting performance
- Standard 1.25” barrel with double taper fits securely in most telescope focusers and diagonals
- Flip-down silicone eyecup helps block stray light and improve comfort
- Ideal for averted vision techniques that reveal faint planetary nebulae or subtle lunar details
🎯 Who It’s For
- Ideal for planetary observers looking for crisp detail at high power
- Perfect for lunar explorers, double star enthusiasts, and compact DSO targets
- Those who want maximum performance from high-quality telescopes on nights of excellent seeing
- Users who value waterproof construction and long-term durability
🔭 What You’ll Be Able to See
- Detailed planetary features such as Jupiter’s Great Red Spot or Saturn’s rings
- Sharp lunar ridges, rilles, and crater walls
- Splitting tight double stars with pinpoint precision
- Compact objects like planetary nebulae and globular clusters, revealed with clarity
- Subtle features using averted vision techniques
🎒 What’s Included
- Explore Scientific 4.5mm 52° Series Waterproof Eyepiece
- Flip-down silicone eyecup
- Top and bottom dust caps
- Soft protective storage pouch
Specs
| Item Number | EPWP5245–01 |
|---|---|
| Focal Length | 4.5mm |
| Apparent Field of View | 52° |
| Eye Relief | 15mm |
| Field Stop Diameter | 4.1mm |
| 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 | 83.5mm |
| Width | 43mm |
| Weight | 181.4g (6.4 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: