Pentax Jupiter 8x40 Porro Prism Binoculars

The Pentax Jupiter 8x40 stands apart from typical binoculars in its class by combining a fully multi-coated optical system with a rugged, waterproof body—features usually reserved for higher-priced models. Its 40mm objectives gather ample light, while the 8x magnification delivers a steady, detailed view that feels natural even during extended observation sessions.

Highlights

• 8x magnification and 40mm objective lenses for bright, clear images
• Porro prism design with fully multi-coated optics for high contrast and colour fidelity
• Wide field of view: 143m at 1000m (8.2° angular)
• Waterproof and nitrogen-purged for fogproof performance in all weather
• Rubber-armored polycarbonate body for a secure, non-slip grip and durability
• Long 15mm eye relief and 5mm exit pupil for comfortable viewing, even with eyeglasses
• Includes neck strap, carrying case, and lens caps

In daily use

From birdwatching at dawn to scanning the horizon on a boat, the Jupiter 8x40 handles it all. The centre focus knob is smooth and intuitive, allowing quick adjustments to track moving subjects. The right-eye diopter lets you fine-tune for vision differences, while the close focus distance of 5 metres makes it surprisingly versatile for observing nearby details like butterflies or flowers.

Full specifications

• Magnification: 8x
• Objective lens diameter: 40mm
• Prism type: Porro
• Lens coating: Fully multi-coated
• Field of view at 1000m: 143m
• Angular field of view: 8.2°
• Apparent field of view: 65.6°
• Exit pupil: 5mm
• Eye relief: 15mm
• Close focus distance: 5m
• Diopter adjustment: Yes, right eyepiece
• Focus system: Centre focus
• Waterproof: Yes
• Fogproof: Yes (nitrogen purged)
• Relative brightness: 25
• Tripod adaptable: Yes
• Body material: Rubber armored polycarbonate
• Colour: Black
• Included accessories: Neck strap, carrying case, lens caps

Final note

For outdoor enthusiasts who demand reliable performance without breaking the bank, the Pentax Jupiter 8x40 delivers a bright, immersive viewing experience in a package built to withstand the elements.