Explore Scientific LER Argon 40mm 62° 2″ eyepiece
Looking for an eyepiece that can handle demanding night-sky conditions, offers comfortable viewing even with glasses, and delivers truly uncompromising optics? The Explore Scientific LER 40mm 62° SWA eyepiece is exactly what you have been looking for. It combines a wide apparent field of view, exceptional eye relief and premium lens coatings in one robust 2″ barrel.
Wide field of view and outstanding eye relief
The 62° apparent field of view is wide enough to give you a genuine "flying through space" sensation, while remaining well-corrected for edge aberrations even with fast optics. The key advantage of this eyepiece is its 28mm eye relief - you do not need to press your eye tightly against the eyepiece, and you can see the entire field of view comfortably through your spectacle lenses. The fold-down eyecup can be adjusted to suit individual needs, so observing sessions become physically relaxed and you can focus on what really matters - the beauty of the night sky. The 2″ barrel makes full use of the light cone of most medium and larger telescopes.
Argon filling and weatherproof protection
One of the most technically interesting features of this eyepiece is its inert argon fill. The argon inside the barrel effectively prevents moisture ingress and fogging of the internal lenses, and also eliminates the risk of fungus growth and dust settling on internal optical surfaces. Combined with the waterproof seal, you can be confident that the eyepiece will withstand humid summer nights or dew-soaked grass if you set it down on the ground. This level of protection is appreciated by anyone who observes regularly in more demanding conditions.
EMD multi-coatings and precision mechanics
Patented EMD multi-coatings (Enhanced Multi-coating Deposition) ensure maximum light transmission and exceptional image contrast. Carefully blackened lens edges eliminate unwanted internal reflections and stray light that would otherwise reduce contrast of fine details - for example when observing nebulae or planetary features against a bright background. The eyepiece barrel is finished with a stainless steel collar featuring a conical safety groove, which securely retains the eyepiece in the focuser even without a locking screw.
The ideal wide-field eyepiece for your collection
The Explore Scientific LER 40mm 62° is an excellent choice as the "survey" member of your eyepiece set. With a 40mm focal length it is particularly suited for finding and observing extended objects - open clusters, large nebulae or the Milky Way - where you will appreciate the combination of low magnification, wide field and a bright image. Eyeglass wearers will love it for its exceptional eye relief, while experienced observers will value its outstanding optical quality and field durability.
Why choose Explore Scientific
Explore Scientific is a brand that puts optical quality first. The LER argon-filled eyepiece series represents one of the best-equipped products in its price category - combining premium EMD coatings, robust mechanical construction and genuine resistance to the elements. Quality is further guaranteed by precise manufacturing meeting strict production standards, which is why this eyepiece holds a stable place among the favourite choices of experienced amateur astronomers worldwide. An investment in an Explore Scientific eyepiece is an investment for years to come.
Technical specifications
| Parameter |
Value |
| Focal length |
40mm |
| Apparent field of view |
62° |
| Eye relief |
28mm |
| Barrel diameter |
2″ |
| Internal fill |
Argon |
| Coatings |
EMD (Enhanced Multi-coating Deposition) |
| Waterproof seal |
Yes |
| Eyecup |
Fold-down, adjustable |
| Barrel collar |
Stainless steel with conical safety groove |
