NATIONAL GEOGRAPHIC 8X40 PORRO BINOCULAR

Description

The National Geographic 8×40 Porro Binocular is a classic, rugged optic designed for clear viewing of distant subjects. With 8x magnification and 40 mm objective lenses, it delivers bright, detailed images suitable for birdwatching, nature observation, hiking, outdoor events, and general travel use. The Porro prism design provides good depth perception and a wide field of view, while full multi-coated lenses enhance brightness, contrast, sharpness, and colour accuracy.

Key Features

Precision optics with full multi-coatings for improved light transmission and image quality.

Porro prism system (BK-7 glass) for edge-to-edge illumination and strong performance in low light.

Rugged rubber-armoured, water-resistant body for a secure grip and protection during outdoor use.

Central focusing wheel for quick, easy adjustments.

Diopter adjustment for spectacle wearers.

Comfortable long eye relief.

Ability to focus on objects as close as approximately 7 m (or about 15 feet in some listings).

Tripod adapter thread for extended viewing sessions.

Includes carrying strap, nylon case, and lens cloth.

Technical Specifications

Optical design: Porro

Magnification: 8x

Objective lens diameter: 40 mm

Prism material: BK-7

Exit pupil: 5 mm

Field of view at 1000 m: approximately 110 m

Relative brightness: 25

Twilight factor: 17.7

Near focus: from 7 m

Eye relief: 15 mm

Interpupillary distance: 56–72 mm

Diopter adjustment: ±2

Focusing system: Central focus wheel

Body: Rubber-armoured, black

Dimensions: approximately 172 x 55 x 155 mm

Weight: approximately 700 g

These binoculars offer a practical balance of performance, durability, and portability, making them a reliable companion for outdoor exploration.

Additional information