The Prosport 8-24x50 Zoom Binocular (Black) from Simmons offers a large 50mm objective that transmits enough light for practical usage during twilight hours or lowlight conditions such as an overcast sky or a poorly lit indoor stadium. Waterproof, fogproof and rubber armoring lend their effectiveness to inclement weather and tough conditions. The optics are fully multi coated for greater brightness with images of sharp contrast. An acceptable eye relief of 19mm at 8 power and an exit pupil of 5mm make this binocular a prudent choice for all around situations.