Explore Scientific 82° Series 1.25" 4.5mm LER Waterproof Eyepiece

The 82° Series 4.5mm LER delivers high-magnification wide-field views with Long Eye Relief — a combination that is difficult to find at any price, let alone $139. With 82° of apparent field, you see nearly 60% more sky than a 52° eyepiece at the same magnification. Lanthanum glass optics, argon-purged waterproof construction, and EMD coatings put this in direct competition with eyepieces costing three times as much.

Key Features

• 82° apparent field of view — immersive, ultra-wide views that make planetary tracking effortless and deep-sky objects feel like you're floating through them
• Long Eye Relief (LER) design — comfortable viewing distance at high magnification, especially valuable for eyeglass wearers
• 7-element lanthanum glass optics — premium glass types deliver sharp, color-corrected images across the full wide field
• Argon-purged waterproof housing — sealed against moisture, fog, and humidity for all-weather reliability
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces with edge-blackened elements
• Fold-down silicone rubber eyecup and 1.25" barrel for standard telescope compatibility

Ideal For

• Planetary observers who want the immersive "spacewalk" experience of an 82° field at high magnification
• Eyeglass wearers — the LER design maintains the full wide field without removing glasses
• Observers upgrading from Plössl or narrow-field eyepieces — the jump to 82° is transformative