Lanthorn Beacon 20x80 binoculars
20x magnification · 80 mm objectives · 3.2° field
$289
Catalog preview. Not available for purchase.
- Package
- Binoculars only
- Optics
- Fully multi-coated optics
- Armor
- Black rubber armor
- Edition
- 2026 edition
Specifications
| Magnification | 20x |
|---|---|
| Objective diameter | 80 mm |
| True field of view | 3.2° |
| Exit pupil | 4.0 mm |
| Dawes limit | 1.45 arcsec |
| Limiting magnitude | 11.5 |
| Eye relief | 15 mm |
| Close focus | 20.0 m |
| Prisms | BaK-4 Porro |
| Weather sealing | Splash-resistant |
| Weight | 2,300 g |
| Package | Binoculars only |
| Optics | Fully multi-coated optics |
| Armor | Black rubber armor |
| Edition | 2026 edition |
Description
The Beacon 20x80 is a large Porro-prism binocular with 80 mm objectives and 20x magnification. It is designed for use on a tripod or a parallelogram mount, where it gives views of deep-sky objects that approach those of a small telescope, with the comfort of using both eyes.
The 80 mm objectives collect about 2.6 times as much light as a 50 mm binocular. At 20x, many globular clusters show granular texture, galaxies such as M51 and M101 show as faint glows under dark skies, and the Orion Nebula shows its wings spreading around the bright core. The 3.2-degree true field still frames the Pleiades and the Double Cluster.
The exit pupil of 4 mm keeps the sky background dark under suburban skies. The BaK-4 prisms give round exit pupils, and the optics are multi-coated. A support rod runs from the tripod socket toward the objectives, which keeps the binocular balanced and reduces flexing that could pull the two sides out of alignment.
At 2,300 g, the Beacon 20x80 is too heavy to hold by hand for more than a few seconds. Use it on a sturdy photo tripod with a fluid head or on a parallelogram mount. Looking near the zenith with a straight-through binocular on a tripod is awkward, so a reclining chair helps.
The 15 mm eye relief suits most observers without glasses. The central focus wheel and right-eye diopter adjust smoothly, and lens caps cover both ends. The Beacon 20x80 is a practical choice for comets, bright galaxies, and star clusters.
A simple routine helps with heavy binoculars: set up the tripod first, level it, then attach the binocular with the support rod pointing forward. Adjust the height so you can look through it without bending, then lock every clamp before you let go.
About this configuration
The Lanthorn Beacon 20x80 binoculars comes in several configurations, and the notes below explain what this particular combination includes. This package contains the binoculars with their strap, lens caps, and case, without any mounting hardware. Binoculars alone suit hand-held scanning of the Milky Way, bright star clusters, and the phases of the Moon. Fully multi-coated optics treat every air-to-glass surface, which raises light transmission and image contrast.
The black armor is the standard finish of the Beacon line and matches its black lens caps. This is the 2026 edition, the most recent version of the Beacon line in the catalog. The magnification, field, and exit pupil figures in the specifications table apply to every configuration of the Beacon line.
What's in the box
- Binoculars with integrated support rod
- Objective and eyepiece caps
- Padded carrying case
- Neck strap
Compatibility notes
- The support rod has a 1/4-20 thread for photo tripods and parallelogram mounts.
- Needs a tripod or mount rated for at least 3 kg.