Corvane Sedge 20x40 binoculars, with photo tripod

Specifications

Description

The Sedge 20x40 is a Porro-prism binocular with 40 mm objectives and 20x magnification. The exit pupil is 2 mm, which keeps the image bright enough for the Moon, bright planets, and double stars. At 20x the true field is 2.5 degrees, about five times the diameter of the full Moon, so you see a small part of the sky at a time.

Magnification this high shows every hand tremor, so use a tripod with a standard binocular adapter, or rest the binoculars on a fence post or car roof. Scan the Orion Nebula, the Double Cluster in Perseus, and the Beehive Cluster in Cancer. Near first quarter, follow the terminator, where crater rims cast long shadows. The narrow field makes objects slower to find, so start with a bright star you can identify, then move the binoculars in small steps.

The BaK-4 Porro prisms and the central focus wheel adjust quickly. The binoculars are not sealed, so keep them out of dew and store them in the soft case when the optics are damp. The 14 mm eye relief suits observers who remove their glasses. Observers who wear glasses may see a reduced field edge, so check the view with glasses on before a session.

At 1100 g, the Sedge 20x40 is heavy to hold for long periods. Use a tripod or a binocular harness, and set the right-eye diopter on a bright star before you focus with the central wheel. The 10 m close focus also allows viewing nearby terrestrial subjects.

About this configuration

This listing covers one configuration of the Corvane Sedge 20x40 binoculars, defined by its package, optical coatings, armor color, and edition year. This package adds a photo tripod and an adapter, so you can hold the binoculars steady without further purchases. A tripod works well for objects at low and medium altitude, though viewing near the zenith becomes awkward on one. Fully multi-coated optics treat every air-to-glass surface, which raises light transmission and image contrast.

Olive rubber armor offers the same protection as the black version in a different color. This is the 2025 edition, which added a firmer diopter lock so the setting holds when you pass the binoculars around. Compare the exit pupil in the specifications with your sky conditions and your age, since both affect how bright the view looks.

What's in the box

• Binoculars with neck strap
• Objective and eyepiece caps
• Soft carrying case
• Lens cleaning cloth
• 1/4-20 tripod adapter
• L-shaped tripod adapter
• Aluminum photo tripod with pan head

Compatibility notes

• The central tripod socket takes a standard L-shaped binocular adapter with a 1/4-20 thread.
• Fits binocular harnesses rated for 1.2 kg.