Eyepiece Explore Scientific LER 40mm 52° 2″

Explore Scientific LER 40mm 52° 2″ eyepiece

If you are looking for a reliable eyepiece that will serve you faithfully for many years - whether you are observing planets or sweeping the Milky Way - the Explore Scientific 52° LER series is exactly what you need. These eyepieces combine a technically refined optical design with exceptional build durability, all at a price that makes real sense.

Flat-field optics for sharp views across the entire field

The Explore Scientific LER 40mm universal flat-field eyepiece offers a corrected apparent field of view of 52°, placing it significantly above standard Plössl designs. The flat-field optical construction delivers outstanding sharpness across the entire field - stars at the edges of the field of view remain pinpoint and crisp, free from unwanted coma or field curvature. This is particularly valuable when observing the Moon and planets, where fine detail matters most.

EMD multi-layer anti-reflection coating

All optical surfaces are treated with the patented EMD (Enhanced Multi-Layer Deposition) anti-reflection coating. This multi-layer surface treatment minimises light loss at every optical surface, suppresses unwanted reflections and ghosting, and results in high-contrast images with excellent light transmission. For visual observers, this means a cleaner, darker sky background and more clearly visible fine detail on planets and nebulae alike.

Argon-filled, waterproof and built to last

The eyepiece is argon-filled and hermetically sealed, effectively preventing internal fogging of the optics even during significant temperature changes. This eliminates the risk of condensation forming on internal optical surfaces, dust settling inside, fungus growing on the glass, or cleaning fluids seeping in. The waterproof construction also ensures the eyepiece handles damp weather conditions and demanding field use without any concern. In short - buy it once, rely on it for years.

The ideal value-for-performance choice

The Explore Scientific 52° LER series offers an ideal price-to-performance ratio for anyone who wants to go well beyond the limitations of standard Plössls without spending on premium wide-field eyepieces. The 40mm focal length combined with the 2″ barrel makes it an excellent eyepiece for wide overview observations with longer focal length telescopes - perfectly suited for open star clusters, large nebulae or getting your bearings on the Moon. The robust, argon-filled construction guarantees this eyepiece will perform reliably through countless nights spent under the stars.

Key specifications