The 52° Series 10mm occupies a versatile sweet spot between planetary magnification and deep-sky brightness, making it one of the most-used focal lengths in any eyepiece collection. Waterproof construction and EMD coatings at this price make it an easy choice for a workhorse eyepiece.

Key Features

• 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 maximize light throughput and contrast
• 4-element, 2-group optical design with edge-blackened elements to control scattered light
• Fold-down silicone rubber eyecup with comfortable eye relief for extended observing, compatible with eyeglasses
• 1.25" barrel fits standard focusers across refractors, reflectors, and catadioptric telescopes

Ideal For

• All-around observers who want a single eyepiece that handles planets, the Moon, and brighter deep-sky objects well
• Globular cluster and planetary nebula fans where moderate-high magnification reveals structure and detail
• Newcomers building a collection — a 10mm is often the first upgrade from a kit eyepiece and the last one retired