Northmere Tundra 15x70 binoculars, with tripod adapter

Specifications

Description

The Tundra 15x70 is a Porro-prism astronomy binocular with 70 mm objectives and 15x magnification. It uses individually focused eyepieces, a design that keeps the body sealed and holds focus on the stars without drifting once you set each side.

The 70 mm objectives show stars about 0.7 magnitude fainter than a 50 mm binocular. At 15x, globular clusters such as M13, M3, and M5 show as round glows with bright cores, the Dumbbell Nebula shows its shape, and the Swan and Lagoon nebulae show structure under dark skies. The 4.5-degree true field frames the Double Cluster and most of the Pleiades.

The Tundra 15x70 has a rigid aluminum body that holds the two optical paths in alignment, which matters at this magnification. The BaK-4 prisms give round exit pupils of about 4.7 mm, and every air-to-glass surface is multi-coated. The body is sealed and nitrogen-purged, so it tolerates dew and cold.

At 1,700 g, the Tundra 15x70 needs support for anything beyond a short look. The central tripod socket takes a standard L-shaped adapter, and a parallelogram mount lets you observe near the zenith without bending your neck. Individual focus means you focus each eyepiece once at the start of a session, then leave it.

Large binoculars give a natural, two-eyed view that many observers find more relaxing than a telescope. The Tundra 15x70 suits sweeping the summer Milky Way, following comets, and observing variable stars with comparison stars in the same field.

Variable-star observers often use binoculars of this size because the field holds a target and several comparison stars at once. The Tundra 15x70 reaches stars fainter than magnitude 10 under dark skies, which covers many long-period variables.

About this configuration

The Northmere Tundra 15x70 binoculars comes in several configurations, and the notes below explain what this particular combination includes. The included tripod adapter lets you fix the binoculars to a photo tripod for steadier, more relaxed views. With the adapter on a tripod, hand shake disappears, which makes faint stars and close double stars easier to see. Multi-coated optics reduce reflections at the main glass surfaces while keeping the price of this binocular low.

Desert tan armor stays cooler in direct sunlight, which helps during daytime use before an evening session. The 2023 edition uses the same prisms and objectives as later years, with small differences in the eyecups. 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 padded neck strap
• Objective and eyepiece caps
• Padded carrying case
• Lens cleaning cloth
• L-shaped tripod adapter

Compatibility notes

• The central tripod socket takes a standard L-shaped binocular adapter with a 1/4-20 thread.
• Needs a photo tripod or parallelogram mount rated for at least 2.5 kg.