• Explore Scientific 72° ED 20mm Waterproof Eyepiece — Wide-Field Deep-Sky Viewing Eyepiece
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Explore Scientific

Explore Scientific 72° ED 20mm Waterproof Eyepiece — Wide-Field Deep-Sky Viewing Eyepiece

Explore Scientific 72° ED 20mm Waterproof Eyepiece — Wide-Field Deep-Sky Viewing Eyepiece

$299.99
$299.99
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The Explore Scientific 72° ED 20mm is a premium telescope eyepiece that delivers low-to-mid power with a wide, immersive 72° field of view — ideal for taking in larger deep-sky objects. An eyepiece sets your magnification, and this 20mm keeps power modest so faint targets stay bright while the generous field frames big nebulae, clusters and star fields beautifully.

Extra-low-dispersion (ED) glass keeps colours tightly focused for sharp, high-contrast views, and the eyepiece is fully waterproof and argon-purged so it won't fog internally in cold or damp conditions.

Who it's for: Observers who want a bright, wide-field eyepiece for deep-sky objects and sweeping starfields. Not sure which focal length to pick? Read our guide to choosing the proper telescope eyepiece.

  • 72° apparent field: a wide, immersive view perfect for framing large deep-sky objects.
  • ED glass optics: extra-low-dispersion elements for sharp, colour-corrected detail.
  • Wide-field 20mm: low-to-mid power that keeps faint objects bright.
  • Waterproof & argon-purged: sealed against fogging and moisture for all-weather use.
  • Comfortable eye relief: designed for relaxed viewing, including for eyeglass wearers.
Specifications
Series 72° ED Waterproof
Focal length 20mm
Apparent field of view 72°
Glass Extra-low-dispersion (ED)
Sealing Waterproof, argon-purged
Barrel size 1.25"

What magnification will I get?
Divide your telescope's focal length by 20. For example, a 900mm scope gives about 45x with this eyepiece.

What is a 72° apparent field of view?
It's how wide the view appears through the eyepiece; 72° is a generously wide field that makes large deep-sky objects and star fields especially immersive.

Why does ED glass matter in an eyepiece?
Extra-low-dispersion glass controls colour and improves sharpness, especially toward the edge of the field.

Does it fit my telescope?
It uses a standard 1.25" barrel, compatible with the vast majority of telescopes and diagonals.

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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