Corvane Lark 15x70 binoculars

Specifications

Description

The Lark 15x70 is a large Porro-prism binocular with 70 mm objectives and 15x magnification. Its objectives collect about twice as much light as those of a 50 mm binocular, which shows fainter stars and makes deep-sky objects easier to see.

At 15x, the Lark 15x70 sits between hand-held binoculars and small telescopes. Globular clusters such as M13 and M22 appear as round glows with bright centers, the Ring Nebula shows as a tiny disk, and galaxies such as M31 show their bright core and dust lane edges under dark skies. The 4.4-degree true field still frames the Pleiades and the Double Cluster.

The exit pupil of about 4.7 mm gives a bright image without a washed-out sky background. The BaK-4 prisms show round exit pupils, and the main optical surfaces are multi-coated.

Hand-holding a 15x binocular is hard for more than a short look, since every tremor shows. A tripod adapter and a sturdy photo tripod are the usual solution, and a parallelogram mount makes looking high in the sky more comfortable. The central tripod socket accepts a standard adapter.

The central focus wheel and right-eye diopter suit most users. Because large binoculars rely on precise alignment of the two optical paths, check the collimation by looking at a bright star: you should see a single sharp point without strain. At 1,380 g, the Lark 15x70 is light for its class and easy to pack for a trip to darker skies.

Collimation drift is a known weakness of large, low-cost binoculars, so handle the Lark 15x70 gently and keep it in its padded case. If the images ever stop merging, a binocular repair service can realign the prisms.

About this configuration

The Corvane Lark 15x70 binoculars comes in several configurations, and the notes below explain what this particular combination includes. Binoculars alone suit hand-held scanning of the Milky Way, bright star clusters, and the phases of the Moon. If you later want steadier views, the tripod socket between the barrels accepts a standard L-shaped adapter. 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 2023 edition of the Lark line, the earliest version that is still listed in the catalog. Before you add a mount or adapter later, check the compatibility notes for the thread and fitting that this binocular uses.

What's in the box

• Binoculars with padded neck strap
• Objective and rain guard caps
• Padded carrying case
• Lens cleaning cloth

Compatibility notes

• The central tripod socket takes a standard L-shaped binocular adapter with a 1/4-20 thread.
• Fits photo tripods and parallelogram mounts rated for at least 2 kg.