Positioned squarely in the mid-magnification range, the 15mm focal length is a true workhorse for visual astronomy. It strikes an ideal balance—offering enough power to enhance contrast and darken the background sky, while still maintaining a generous field of view for tracking extended deep sky objects like galaxies, nebulae, and open clusters. This makes a noticeable difference under light-polluted suburban skies, where visibility can be limited.
As part of the Explore Scientific 52° Series, this eyepiece delivers premium performance and durability in an affordable design. Featuring argon-purged waterproof construction, fully multi-coated EMD optics, and a flat-field 6-element design, it provides bright, crisp, high-contrast views across the entire 52° apparent field of view.
Its 16.3mm eye relief ensures a comfortable experience for eyeglass wearers and long observation sessions, while the included flip-down silicone eyecup helps with proper eye positioning and stray light control.
CA Residents: Prop 65 WARNING(S)
🌟 Features & Benefits
- 15mm focal length delivers ideal mid-range magnification for deep sky, planetary, and lunar targets
- 52° apparent field of view offers a well-balanced, immersive viewing window
- 16.3mm eye relief provides extended viewing comfort, even with glasses
- 6-element / 3-group flat-field optical design with edge-blackened lenses for enhanced contrast
- EMD (Enhanced Multi-Layer Deposition) coatings maximize light transmission and clarity
- Argon-purged and waterproof sealed to prevent fogging and internal contamination
- Designed to support averted vision techniques for faint object detection
- 1.25" barrel with double taper fits securely in standard telescope focusers and diagonals
- Flip-down silicone rubber eyecup for customizable comfort and glare reduction
- Built with premium optical glass and rugged aluminum housing for long-term durability
🎯 Who It’s For
- Visual astronomers who want a versatile, high-contrast mid-power eyepiece
- Deep sky and galaxy hunters working under suburban or light-polluted skies
- Observers who value long eye relief and waterproof protection in a compact design
- Users building a well-rounded eyepiece kit with flat-field performance
🔭 What You’ll Be Able to See
- Detailed structure in galaxies, nebulae, and open clusters
- Enhanced contrast on planetary features and lunar terrain
- Brighter views of Messier objects and dimmer DSOs when using averted vision
🎒 What’s Included
- Explore Scientific 15mm 52° Series Waterproof Eyepiece
- Top and bottom dust caps
- Flip-down silicone rubber eyecup
- Soft protective pouch
Specs
| Item Number | EPWP5215–01 |
|---|---|
| Focal Length | 15mm |
| Apparent Field of View | 52° |
| Eye Relief | 16.3mm |
| Field Stop Diameter | 15.5mm |
| Optical Elements / Groups | 6 Elements in 3 Groups |
| Lens Coatings | EMD (Enhanced Multi-Layer Deposition) |
| Barrel Size / Type | 1.25" (31.7mm) / Tapered |
| Filter Thread | Standard 1.25" (M28.5 x 0.6) |
| Waterproofing | Argon Purged; O-Ring Sealed |
| Test Rating | Submersible to 1 Meter for 30 Minutes |
| Eyecup | Removable Flip-Down Silicone Rubber |
| Size (L x W) | 93mm x 43mm |
| Weight | 206g (7.3 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: