Designed by birders for birders, the 820 Swift Audubon took over two years in the making with valuable input from leading birders across the country. The results? A birding binocular that exceeds all expectations. And still at an affordable price.
The Swift Sport Optics 8.5x44 Porro Prism is commonly used for Bird watching and more.One reason why the Swift Sport Optics 8.5x44 Porro Prism is popular is because of its Quality lenses.
|Type of Prism||Porro, BAK-4 prisms|
|Real Angular Field of View||8.2°|
|Field of View at 1000 Yards||430'|
|Exit Pupil||5 mm|
|Eye Relief||17 mm|
|Close Focus Distance (ft)||10'|
|Rubber Coated (Armored)||Yes|
|Waterproof / Fogproof||Yes|
|Special Features||ED Glass|