Eyepiece Explore Scientific LER 4.5mm 52° 1.25″

Explore Scientific LER 4.5mm 52° 1.25″ eyepiece

The Explore Scientific LER 4.5mm 52° 1.25″ eyepiece belongs to the premium 52° LER series, which represents an excellent combination of optical quality, observing comfort and durable construction. This eyepiece is designed as a universal flat-field eyepiece that delivers exceptionally sharp images across the entire field of view. This characteristic is especially noticeable when observing planets and the Moon, where every detail matters and where cheaper eyepieces often fall short at the edges of the field of view.

52° corrected field of view - a step above standard Plössl

Eyepieces in the Explore Scientific 52° LER series offer a corrected field of view of 52°, which makes them significantly superior to simpler Plössl-type eyepieces. While standard Plössl eyepieces suffer from field curvature and chromatic aberrations - particularly at the edges - LER eyepieces deliver a sharp, high-contrast image from the centre right to the edge of the field of view. This is appreciated by both beginning astronomers and experienced observers looking for a reliable, high-performance eyepiece for regular use.

EMD multi-layer anti-reflection coatings

One of the key technological features of this eyepiece is the patented EMD (Enhanced Multi-Layer Deposition) anti-reflection coating applied to all optical surfaces. This coating ensures high contrast in the resulting image and effectively prevents unwanted reflections and ghost images that would otherwise degrade the quality of observation. The result is a bright, sharp and high-contrast image with minimal light scatter - which is especially important when observing faint objects or fine detail on planetary surfaces.

Argon-filled waterproof construction

Waterproof and argon-filled construction guarantees a long service life and reliable performance in a wide range of weather conditions - in dew, on humid nights and when moving between environments with different temperatures. The eyepiece is filled with argon, an inert gas that effectively prevents internal fogging of the optical surfaces. This technology also protects the internal optics from dust, biological growth (fungus on glass) and potential ingress of cleaning fluids. The eyepiece therefore requires no special maintenance and is ready to serve reliably through countless observing sessions for many years.

Long eye relief - comfortable for eyeglass wearers

Thanks to the long eye relief (LER - Long Eye Relief), the eyepiece can be used comfortably by observers who wear glasses, without losing any part of the field of view. The Explore Scientific 52° LER series is the ideal choice for astronomers who demand the highest observing comfort and optical quality at a favourable price-to-performance ratio.

Ideal for high-magnification planetary observation

The short focal length of 4.5mm makes this eyepiece particularly suited to detailed observation of planets, the Moon and double stars at high magnification. Whether you are studying the cloud bands of Jupiter, the rings of Saturn or the craters of the Moon, this eyepiece delivers the resolution and contrast needed to make the most of your telescope.

Key specifications