Orion Sirius Plössl 25mm Eyepiece (1.25") USED

Orion Sirius Plössl 25mm Eyepiece (1.25") USED

The Orion Sirius Plossl 25mm 1.25” Multi‑coated Telescope Eyepiece is a versatile, high-quality eyepiece designed for low-power, wide-field observations of the night sky. With its 25 mm focal length, it provides bright, comfortable views that are ideal for scanning star fields, observing open clusters, and viewing large deep-sky objects such as nebulae and galaxies.

Built around a classic 4-element Plössl optical design, the Sirius eyepiece delivers sharp, high-contrast images across most of the field. The lenses are fully coated with magnesium-fluoride anti-reflection coatings, helping maximize light transmission while minimizing glare and internal reflections.

The eyepiece offers a 52° apparent field of view, giving a natural and comfortable perspective while keeping celestial objects in view longer—especially useful for telescopes without motorized tracking. Its approximately 17 mm eye relief provides comfortable viewing even during extended observing sessions.

Constructed with a durable black-anodized aluminum body and a chrome-plated 1.25″ barrel, the eyepiece fits virtually all standard telescope focusers. The barrel is threaded for standard 1.25″ filters, and a rubber eyeguard helps block stray light and maintain proper eye placement for improved viewing comfort.

Reliable, sharp, and easy to use, the Orion Sirius 25 mm Plössl is an excellent general-purpose eyepiece and a popular choice for beginner and intermediate astronomers alike.

Key Features

• 25 mm focal length for low-power, wide-field observing

• 52° apparent field of view for comfortable sky scanning

• 4-element Plössl optical design for sharp, high-contrast images

• Fully coated optics for improved light transmission

• ~17 mm eye relief for comfortable viewing

• Standard 1.25″ barrel compatible with most telescopes

• Threaded for 1.25″ filters

• Durable anodized aluminum construction with rubber eyeguard

In the Box

Orion Sirius Plössl 25mm Eyepiece (1.25") USED