Explore Scientific BinoViewer for Telescopes

A 1.25-inch binocular viewer with built-in erecting prisms that lets you observe through both eyes simultaneously — delivering a three-dimensional sense of depth on the Moon, planets, and bright deep-sky objects that single-eyepiece viewing cannot match.

Using both eyes reduces fatigue during long observing sessions and engages your brain's natural depth perception. With a non-inverting diagonal, such as a pentaprism, the image is erect, which suits terrestrial daytime viewing as well as astronomy; with a mirror or roof-prism diagonal it is upside down and may be reversed left to right. Fully multi-coated optics throughout the light path maintain brightness and contrast.

The sliding interpupillary adjustment (58–74 mm) accommodates a wide range of face geometries, and a diopter ring on one eyepiece holder lets you match the second eye after focusing the telescope for the first. A parfocal design means you can center a target in a single wide-field eyepiece, then swap to the BinoViewer without losing focus. Twist-lock, self-centering eyepiece holders secure your eyepieces without set screws that can mar barrels.

Key Features

• Built-in erecting prisms for correctly oriented views
• Fully multi-coated optics for maximum brightness and contrast
• Sliding interpupillary distance: 58–74 mm
• Diopter adjustment on one eyepiece holder
• Twist-lock, self-centering 1.25" eyepiece holders
• Parfocal design for quick transitions from finder eyepiece
• Compatible with refractors, reflectors, and Schmidt-Cassegrains

Ideal For

• Lunar and planetary observers — binocular vision reveals surface detail that single-eye viewing misses
• Long observing sessions — two-eye viewing is more comfortable
• Terrestrial and daytime use — an erect image with a pentaprism or half-pentaprism diagonal

Good to Know

• Eyepieces are sold separately — use matched pairs of 1.25" eyepieces for best results
• Works best with telescopes that have sufficient back-focus (SCTs, long-focus refractors); fast Newtonians may require a Barlow to reach focus