Explore Scientific 62° Argon-Purged Eyepiece Series — 1.25-Inch Waterproof Eyepieces for Clear Night Sky Views

The Explore Scientific 62° Argon-Purged Eyepiece Series is a line of durable, wide-field 1.25-inch telescope eyepieces built for bright, sharp, high-contrast views. The 62° apparent field of view gives you a comfortably wide window on the sky, and the fully multi-coated optics deliver crisp images of the Moon, planets, star clusters, and nebulae.

Every eyepiece in the series is argon-purged, O-ring sealed, and waterproof, so it resists internal fogging and moisture even on damp observing nights — a real advantage over standard eyepieces that can dew up and lose contrast.

Who it's for

Beginner and intermediate stargazers who want a reliable, great-value set of eyepieces to cover everything from high-power planetary views to wide, low-power deep-sky sweeps. Because they share the same 62° field and 1.25" barrel, they make an easy series to collect. New to eyepieces? See our guide on how to pick the proper telescope eyepiece.

Key features

• 62° apparent field of view for immersive, comfortable observing
• Fully multi-coated optics for bright, high-contrast images
• Argon-purged, waterproof, and fog-proof — consistent performance in damp conditions
• O-ring sealed housing protects the internal lenses from dust and moisture
• Standard 1.25" barrel fits most telescopes and accepts 1.25" filters
• Slip-resistant textured grip for secure handling in the dark

Choosing your focal length

Shorter focal lengths (like 5.5mm and 9mm) give higher magnification for the Moon and planets; longer focal lengths (like 32mm and 40mm) give lower magnification and a wider view, ideal for large star clusters and nebulae. Many observers build a small set — one short, one medium, one long — to cover most targets.

Specifications

Eye relief values are approximate and vary by focal length. All models are argon-purged, waterproof, and fully multi-coated.

Frequently asked questions

Will these fit my telescope?
Yes, if your telescope or diagonal accepts standard 1.25" eyepieces — which the large majority do. The barrels also accept 1.25" filters.

What does "argon-purged and waterproof" actually get me?
The eyepieces are sealed and filled with argon gas, so they resist internal fogging and moisture on humid or dewy nights. That means steadier contrast and less downtime wiping optics.

Which focal length should I buy first?
A mid-range eyepiece (around 14–26mm) is the most versatile starting point for general viewing. Add a short focal length (5.5–9mm) later for higher-power planetary detail.

How do I work out the magnification?
Divide your telescope's focal length by the eyepiece focal length. For example, a 1000mm telescope with a 20mm eyepiece gives 50× magnification.