Explore Scientific LER 15mm 52° 1.25″ eyepiece
Looking for an eyepiece that performs equally well on planets and nebulae, stays fog-free on cold nights and lasts for years without any trouble? The Explore Scientific LER 15mm from the 52° series is exactly that choice. It is a universal flat-field eyepiece designed to deliver exceptionally high image sharpness across the entire field of view - something you will appreciate when observing planets, the Moon and extended deep-sky objects alike.
Optical performance
At the heart of this eyepiece is the patented EMD anti-reflection coating (Enhanced Multi-Layer Deposition), which ensures high contrast and effectively suppresses unwanted reflections and ghosting. The result is a vivid, clean image with faithful detail - whether you are studying fine structures on Jupiter, mountain ridges on the Moon or globular star clusters.
The 52° field of view is corrected so that stars remain sharp all the way to the edge, which makes this eyepiece a significant step up from simpler Plössl designs.
Durability and all-weather reliability
The Explore Scientific LER 15mm eyepiece is argon-purged to prevent internal fogging when temperatures change - exactly the situation you encounter when carrying your telescope from a warm room out into a frosty night. The waterproof construction also protects the optics from dust, fungus and cleaning fluid seepage. This eyepiece is built to serve reliably for years, whether you observe from your garden or travel to dark-sky sites far from the city.
Long eye relief - comfortable for eyeglass wearers
The Explore Scientific 52° LER series offers an excellent price-to-performance ratio in the quality wide-angle eyepiece segment. Thanks to generous long eye relief (LER), the eyepiece is comfortable for observers who wear glasses. The entire series is designed with an emphasis on durability and optical precision - so you are investing in equipment that truly delivers, night after night, year after year.
Key features at a glance
- Focal length: 15mm
- Apparent field of view: 52°
- Barrel size: 1.25″
- Long eye relief (LER) - suitable for eyeglass wearers
- Patented EMD multi-layer anti-reflection coating
- Argon-purged - fog-proof in cold conditions
- Waterproof construction
- Sharp, flat field from center to edge
- Suitable for planets, the Moon and deep-sky objects
Technical specifications
| Parameter |
Value |
| Focal length |
15mm |
| Apparent field of view |
52° |
| Barrel diameter |
1.25″ |
| Eye relief |
Long (LER) |
| Coating |
EMD (Enhanced Multi-Layer Deposition) |
| Gas filling |
Argon |
| Construction |
Waterproof |
