Explore Scientific 52° Series 1.25" 15mm Waterproof Eyepiece

The 52° Series 15mm delivers comfortable medium-power views ideal for deep-sky detail. It has argon-purged waterproof construction and EMD-coated optics.

Key Features

• Argon-purged waterproof housing, sealed and fog-proof. O-ring seals keep dirt, fungus and cleaning fluid from getting between the lenses.
• Enhanced Multi-Layer Deposition (EMD) coatings on all air-to-glass surfaces. The patented coating gives high contrast and suppresses reflections and ghosting.
• 6-element, 3-group optical design with edge-blackened elements to reduce stray light
• Fold-down silicone rubber eyecup for relaxed eye relief, including with eyeglasses. Its 16.3 mm of eye relief is the distance at which your eye takes in the whole field.
• 1.25" barrel. Stainless steel, tapered for a more secure hold.
• Parfocal series. All 52° Series eyepieces focus at about the same point, so swaps need little refocusing.

Ideal For

• Deep-sky observers who want enough magnification to resolve detail in planetary nebulae and smaller galaxies
• General-purpose viewing: a reliable medium-power option
• Suburban skies. This focal length darkens the background sky, and the added contrast can change how galaxies and nebulae look from the suburbs.

Accessories & Compatibility

• Dobsonians. Through the 1.25" adapter of a 2" focuser, the 15mm gives 51x, a 3.0 mm exit pupil and a 1.0° true field in the 6" f/5 Tabletop Dobsonian (760 mm), and 85x with a 0.61° true field in the 10" f/5 Hybrid Truss Tube Dobsonian (1270 mm).
• Filters. The barrel is threaded for filters, such as the 1.25" Nebula Filter CLS, a light-pollution filter for nebulae and galaxies.