Corvane Lark 15x42 binoculars, with parallelogram mount

Specifications

Description

The Lark 15x42 binoculars combine 15x magnification with 42 mm objectives, which gives an exit pupil of 2.8 mm. That pupil is small enough that the image stays bright in moderate light pollution, and the higher magnification shows lunar craters, the rings of Saturn, and the four bright moons of Jupiter. The 3.4-degree true field, about 51 degrees apparent, is narrower than a wide-field model, so sweeping across the Milky Way takes a little more time than with a 7x binocular.

Because the magnification is high, a steady hold matters more here than with lower-power models. Rest your elbows on a wall, a car roof, or a stable table, and brace yourself before you start to scan. At 1,300 g, the Lark 15x42 is heavy enough to tire the arms during a long session, so plan for support. The central focus wheel moves both barrels together, and the right-eye diopter corrects for differences between your two eyes, which matters at 15x because small focus errors show quickly.

The BaK-4 Porro prisms and multi-coated lens surfaces transmit most of the light that enters the objectives. The lenses are coated to reduce reflections, which keeps stars sharp near the edge of the field. The 14 mm eye relief allows observers who wear glasses to see most of the field, provided the rubber eyecups stay folded down. Close focus of 5.0 m lets you examine nearby objects, such as a leaf or a bird on a fence, although the binoculars are designed mainly for distant views.

For a first session, start with the Moon near its terminator, where the shadows along crater walls show relief. Then turn to the Pleiades and the Beehive Cluster in Cancer, and compare how many stars each one reveals. Double stars such as Mizar in the Big Dipper are a useful check for focus, since the two components separate at this power. Keep a short log of what you see, and return to the same targets on a darker night to judge how the view changes with sky quality.

About this configuration

The Corvane Lark 15x42 binoculars comes in several configurations, and the notes below explain what this particular combination includes. The parallelogram mount keeps the binoculars at eye level while you move them across the sky in smooth arcs. A parallelogram mount lets observers of different heights share the same view without aiming the binoculars again. Multi-coated optics reduce reflections at the main glass surfaces while keeping the price of this binocular low.

The tan armor is easy to spot when you set the binoculars down on the grass in the dark. This is the 2023 edition of the Lark line, the earliest version that is still listed in the catalog. 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 rain guard caps
• Soft carrying case
• Lens cleaning cloth
• Parallelogram mount with counterweight
• Tripod adapter

Compatibility notes

• The central tripod socket takes a standard L-shaped binocular adapter with a 1/4-20 thread.
• Fits binocular harnesses and parallelogram mounts rated for 1.5 kg binoculars.