Explore Scientific 68° Series 1.25" 16mm Waterproof Eyepiece

The 68° Series 16mm uses a multi-element design that combines low-dispersion and high-refractive-index glasses. At 68°, the field of view is wider than standard Plössl or 52° eyepieces: you see more sky in every glance. It has argon-purged waterproof construction and multilayer deposition coatings.

Key Features

• 6-element optics in 4 groups: low-dispersion and high-refractive-index glasses work together for sharp images across the field
• 68° apparent field of view: a step up from 52° designs, providing wide, immersive views that make tracking objects easier
• Argon-purged waterproof housing, sealed against moisture and fog
• Water-tested. Each eyepiece is tested in one meter of water for 30 minutes.
• Multilayer deposition coatings on all air-to-glass surfaces with edge-blackened elements for high contrast. Each coating has 15 layers.
• Fold-down silicone rubber eyecup for comfortable eye relief during extended sessions
• 11.9 mm of eye relief, the shortest in the 68° Series. The 68° Series 24mm and longer models have over 18 mm, which suits eyeglass wearers.
• 1.25" barrel
• Parfocal series. The 68° Series eyepieces focus at nearly the same point, so switching needs little refocusing.

Ideal For

• Observers upgrading from Plössl or 52° eyepieces
• Deep-sky observing with a wide field and low-dispersion glass

Accessories & Compatibility

• Dobsonians. Through the 1.25" adapter of a 2" focuser, the 16mm gives 48x, a 3.2 mm exit pupil and a 1.4° true field in the 6" f/5 Tabletop Dobsonian (760 mm), and 79x with a 0.82° 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.