Corvane Sedge 20x40 binoculars

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 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. The multi-coated version suits casual scanning of the night sky as well as daytime nature viewing.

The black armor is the standard finish of the Sedge line and matches its black lens caps. This is the 2024 edition, which revised the focus wheel and the strap attachment points of the Sedge line. The magnification, field, and exit pupil figures in the specifications table apply to every configuration of the Sedge line.

What's in the box

• Binoculars with neck strap
• Objective and eyepiece caps
• Soft carrying case
• Lens cleaning cloth
• 1/4-20 tripod adapter

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.