Explore Scientific 4.5mm 82° 1.25" LER Eyepiece
For astronomers looking to push their telescope to the limits of magnification while maintaining a comfortable and immersive view, the Explore Scientific 4.5mm 82° 1.25” LER eyepiece is a top-tier choice. Whether you’re resolving the intricate cloud bands of Jupiter, tracking Saturn’s Cassini Division, or splitting challenging double stars, this eyepiece delivers sharp, high-contrast views across an expansive field of view.
Designed with premium optical coatings, precision-machined construction, and an ergonomic long eye relief design, this eyepiece is a valuable addition to any serious observer’s collection. Unlike many high-magnification eyepieces that require observers to press their eye uncomfortably close to the lens, this model offers a generous 15mm of eye relief, making it an excellent choice for both eyeglass wearers and those who simply prefer a more relaxed viewing experience.
Adding to its durability, the Explore Scientific 4.5mm 82° eyepiece is fully waterproof and argon-purged, ensuring it remains fog-free and protected from dust, debris, and moisture for years to come.
A Wide-Field Immersive Experience at High Magnification
One of the standout features of this eyepiece is its 82-degree apparent field of view, which provides a truly immersive experience, even at high magnifications. High-power eyepieces traditionally suffer from narrow fields, requiring frequent adjustments to keep objects centered—especially in manually-tracked telescopes like Dobsonians.
The ultra-wide field in this eyepiece eliminates that concern, giving you:
- More time to observe fine planetary details before objects drift out of view
- Easier manual tracking, especially for non-motorized telescopes
Whether you’re studying the fine details of the lunar surface, following Jupiter’s Great Red Spot, or pushing your telescope to its theoretical limits for resolving globular clusters, this eyepiece provides an expansive and natural-looking view.
Precision Optics for Maximum Contrast and Clarity
Explore Scientific’s reputation for premium optics is evident in the build quality of the 4.5mm 82° eyepiece. The fully multi-coated lenses ensure superior light transmission while minimizing internal reflections, glare, and ghosting. This results in brighter, more contrast-rich views with excellent color fidelity, allowing observers to distinguish subtle planetary features, faint deep-sky structures, and sharp stellar points with ease.
Unlike some high-power eyepieces that lose clarity near the edges, this model maintains sharpness from center to edge, ensuring that the entire field remains crisp and distortion-free.
Comfortable Viewing with Long Eye Relief
High-magnification eyepieces are often notorious for their short eye relief, making extended observation sessions uncomfortable—especially for those who wear glasses. The Explore Scientific 4.5mm 82° model is specifically designed to overcome this issue, offering 15mm of eye relief for a more relaxed and strain-free experience.
This feature benefits:
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Eyeglass wearers, who can view the full field without having to remove their glasses
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Observers engaged in long stargazing sessions, reducing eye fatigue
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Binoviewer users, where maintaining a consistent and comfortable eye position is essential
The foldable rubber eyecup provides additional comfort and helps block out stray light, ensuring that your eye remains focused on the celestial target without distractions.
Argon-Purged, Waterproof, and Built to Last
Unlike many eyepieces that rely on nitrogen purging, the Explore Scientific 4.5mm 82° is argon-purged, offering superior resistance to fogging, moisture intrusion, and internal contamination. Argon molecules are larger than nitrogen molecules, which means they are less likely to diffuse out over time, ensuring that the purging protection remains effective for years.
The benefits of this waterproof, argon-purged design include:
- No internal fogging, even in humid or rapidly changing temperatures
- Protection from dust and debris, ensuring long-term optical clarity
- Easier cleaning, as the sealed design prevents contaminants from entering the eyepiece
For those who frequently observe in humid environments, transport their gear to different climates, or simply want an eyepiece that will last for decades, this level of durability is a significant advantage.
Solid Construction for a Secure Fit
The Explore Scientific 4.5mm eyepiece is built with a precision-machined, anodized aluminum barrel, ensuring a secure fit in any 1.25-inch focuser or diagonal. The rugged construction withstands years of use while maintaining a lightweight, balanced feel. The textured rubber grip adds a layer of security, making handling easier even in cold weather when gloves might be necessary.
This eyepiece is also parfocal with other Explore Scientific 82-degree models, meaning little to no refocusing is needed when switching between focal lengths. This makes it easier to move between magnifications quickly without wasting time readjusting focus.
Who Should Consider the Explore Scientific 4.5mm 82° Eyepiece?
This eyepiece is a fantastic option for:
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Lunar and planetary observers who want high-power views of fine details without sacrificing field of view
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Deep-sky enthusiasts looking for better framing of small planetary nebulae, tight globular clusters, and finer galaxy structures
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Dobsonian telescope users who need more time between manual tracking adjustments
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Eyeglass wearers who require generous eye relief for a comfortable experience
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Observers in humid or variable climates who need waterproof, fog-proof optics that stand up to the elements
Why Choose the Explore Scientific 4.5mm 82° Eyepiece?
- Expansive 82-degree field of view for immersive observing
- 4.5mm focal length ideal for high-magnification planetary and deep-sky detail
- 15mm of long eye relief for eyeglass wearers and comfortable viewing
- Fully multi-coated optics for improved brightness and contrast
- Waterproof and argon-purged to prevent fogging and contamination
- Precision-machined 1.25-inch barrel with a secure, stable fit
- Parfocal with other Explore Scientific 82-degree eyepieces for minimal refocusing
If you’re in search of a high-power eyepiece that combines sharp, high-contrast views with an immersive, wide field and superior durability, the Explore Scientific 4.5mm 82° 1.25” LER eyepiece is an exceptional choice. Whether you’re exploring the intricate details of planets, navigating deep-sky wonders, or pushing your telescope’s resolution to the limit, this eyepiece delivers the performance and comfort needed for serious astronomical observation.
Upgrade your eyepiece collection and experience the universe in greater detail than ever before.
