52° Series Waterproof Telescope Eyepieces

The Explore Scientific 52° Series offers waterproof, gas-purged telescope eyepieces with a flat-field, multi-element optical design that delivers sharp, high-contrast views across the field at an accessible price. With a classic 52-degree apparent field, these eyepieces provide comfortable, distortion-free viewing that is ideal for lunar and planetary observing, double stars and smaller deep-sky objects.

Available in a full range of focal lengths, from short high-power eyepieces for the Moon and planets to longer low-power options for finding and framing objects, the 52° Series makes it easy to build a complete eyepiece set. They are an excellent upgrade from the basic eyepieces included with many beginner telescopes, offering better sharpness, contrast and durability. Whether you observe with a refractor, a Newtonian reflector, a Dobsonian or a Maksutov-Cassegrain telescope, 52° Series eyepieces give you dependable optical quality and great value for every observing session.

When selecting 52° Series eyepieces, consider your telescope's focal length: dividing it by the eyepiece focal length gives you magnification. Shorter focal lengths such as 3mm to 6.5mm provide high power for planetary detail, mid-range 10mm to 20mm eyepieces handle most deep-sky viewing, and 25mm to 40mm eyepieces provide wide, low-power views for locating objects. Because the series shares a consistent design, it is easy to build a balanced eyepiece set over time. The 52° Series is an ideal choice for beginners upgrading their first telescope, for students and classrooms, and for experienced observers who want reliable, affordable eyepieces.