Explore Scientific 92° Series 2" 17mm LER Waterproof Eyepiece

Explore Deep-Sky Objects in One Field

Want to explore wide nebulae and clusters with ease? The 17mm 92° eyepiece gives you immersive views—without sacrificing edge sharpness or eye comfort.

Features

• Ultra-Wide 92° Apparent Field of View – Soak in massive swaths of sky in a single view, ideal for sweeping across the Milky Way or framing large deep-sky objects.
• Generous 20mm Eye Relief – Long eye relief provides full-field comfort, even for glasses wearers observing over extended sessions.
• Argon-Purged Waterproof Housing – Sealed against fog, moisture, and internal condensation—ready for any environment or elevation.
• 2-Inch Barrel Compatibility – Fits all standard 2" focusers and diagonals with secure mechanical fit and optical precision.
• Precision Lens Coatings (EMD) – Enhanced multi-layer coatings boost light transmission and contrast for stunning clarity.
• Field Stop Diameter: 27.46mm – Delivers distortion-free, edge-to-edge sharpness even at ultra-wide angles.
• Durable, Heavy-Duty Construction – Built to handle its 2.4 lb weight with solid, field-ready reliability.

The Explore Scientific 92° 17mm is for you if…

• You use a manual Dobsonian or alt-az mount and want longer object dwell times with less frequent tracking adjustment.
• You enjoy wide-field deep-sky observing—perfect for framing open clusters, scanning nebulae, and catching large galaxies in a single field.
• You wear glasses and demand true wide-field comfort without sacrificing image quality or field access.
• You’re looking to upgrade from budget eyepieces that suffer from field curvature, distortion, or chromatic aberration at the edges.
• You regularly observe in humid, cold, or dewy conditions, and need an eyepiece that won’t fog or corrode over time.

The Explore Scientific 92° 17mm eyepiece is built for the observer who values wide, immersive views—but doesn’t want to compromise on edge clarity, contrast, or comfort. At 17mm, this eyepiece excels at low-to-mid magnification, giving you beautifully framed views of extended deep-sky objects, star fields, and sweeping lunar landscapes.

With a massive 92° apparent field and sharp, flat optics across the entire view, you'll feel like you're drifting through space—not just looking at it. It's the kind of experience where you forget the eyepiece is even there.

For those who rely on averted vision to spot faint structures, this eyepiece delivers. Its high-transmission coatings and wide-angle geometry help place elusive targets onto the most light-sensitive part of your eye—bringing detail where others fail.

Comfort is non-negotiable for serious observers. Whether you wear glasses or just spend hours at the scope, the 20mm eye relief keeps your eyes relaxed and your view complete. No shifting, no squinting, just sky.

Weather-resistant, argon-purged, and rock-solid—it’s ready for your darkest skies and most demanding conditions. This is more than an upgrade; it’s an invitation to experience your telescope at its full potential.