Founder Optics Bino-One Binoviewer

Most binoviewers require significant back focus, which often forces you to use a Barlow lens or corrector that changes your telescope's magnification. The Bino-One's zero optical path design allows you to use it with most telescopes without needing that extra magnification, letting you maintain your telescope's native focal length and field of view.

Yes, it is designed for broad compatibility. Because it doesn't require the extensive back focus of traditional binoviewers, it integrates seamlessly with both refractor and reflector systems, including those with limited focus travel.

The Bino-One features a linear sliding housing design. You simply slide the two eyepiece holders toward or away from each other to match your interpupillary distance, which is adjustable between 58mm and 74mm.

No, the Bino-One provides an erect image, meaning the view is oriented correctly. This makes it an excellent choice for terrestrial observation, such as birding or landscape viewing, in addition to astronomy.

The included Alien 12.5mm eyepieces are matched specifically for this unit to ensure consistent performance right out of the box. They feature twist-lock holders to keep them secure, though the 1.25-inch barrel size means you can experiment with other eyepieces if you prefer different magnifications.

The dielectric coating is applied to the internal optics to ensure 99% surface reflection. This results in a significantly brighter, higher-contrast image compared to standard mirror coatings, which is crucial when splitting the light path between two eyes.