Nikon's black 8x42 ProStaff 7S Binoculars are part of the flagship line of their ProStaff series and come outfitted with an array of optical and design features to give users the ability to discern details of distant subjects—in even the most challenging light and harshest weather.

They feature phase-corrected roof prisms that have been further treated with highly reflective mirror coatings, and anti-reflection fully multicoated optical surfaces that work together to maximize light transmission, while limiting internal diffraction and interference, to produce bright and clear high-contrast images with accurate color rendition across the entire visual spectrum. The 42mm objectives boost their light-gathering ability to improve views in challenging light such as at dawn and dusk, or in foggy and cloudy weather, without the bulk and weight of larger-objective models. Their comfortable exit pupils, long eye relief, and spacious field of view help to minimize the movement of the horizon line on rough or rolling seas to limit disorientation when using them on a boat. This allows users to enjoy an immersive observational experience from early morning to late evening.

Complementing the optical performance are construction details that make the binoculars durable and comfortable to use. They have a lightweight and corrosion-resistant reinforced polycarbonate resin chassis and is protected by black rubberized armor that is accented with textured palm pads to give them a secure non-slip grip. The optical tubes are nitrogen filled and O-ring sealed to be waterproof and submersible, as well as resistant to internal fogging when moving through extreme temperature variations and environmental conditions. A tethered one-piece ocular rainguard covers the eyecups as the binoculars hang around the neck and prevent rain and spraying water from filling them. The objective lens caps can clip onto the neck strap to keep them safe from blowing overboard or being lost on the forest floor.