100° Series Waterproof Telescope Eyepieces

Explore Scientific's 100° Series eyepieces deliver one of the widest apparent fields of view available to amateur astronomers, creating an immersive 'spacewalk' experience where the edge of the field nearly disappears. This hyper-wide design lets you take in large star clusters, sprawling nebulae and rich Milky Way star fields all at once, and it keeps objects in view longer on non-tracking telescopes such as Dobsonians.

Each 100° eyepiece is waterproof and argon-purged to help resist internal fogging and contamination, with fully multi-coated optics designed to produce bright, high-contrast images. Available in a range of focal lengths, the 100° Series covers everything from low-power, wide-field sweeping to high-power lunar and planetary observing while maintaining that expansive field. For observers who want the most dramatic, panoramic views their telescope can deliver, the 100° Series is a favorite among deep-sky observers and visual astronomers who demand premium performance from their telescope eyepieces.

Because of their wide field stops, 100° eyepieces are especially well matched to Dobsonian telescopes and Newtonian reflectors, where a coma corrector can further sharpen stars toward the edge of the field. They also pair beautifully with ED APO refractors for crisp, color-free wide-field views. Observers often use a 100° eyepiece as the centerpiece of their eyepiece case, pairing it with a focal extender for additional magnification options. If you have ever wanted to feel immersed in the night sky rather than looking at it through a small window, the 100° Series offers one of the most memorable observing experiences in amateur astronomy.