Zeiss Terra ED Binoculars 10x42 - Zeiss Terra ED added magnification without adding extra weight. For situations in the field that call for a closer look, such as observing the fine details of birds or wildlife, the 10x42 delivers bright, crisp images, even in low light. With a stunning 5.25 ft close focus and a generous wide field of view, you'll never miss a thing. Magnification: 10xEffective lens diameter: 42mmExit Pupil Diameter: 4.2mmTwilight Factors: 20.5Field of View at 1000 yd: 330 ftSubjective Viewing Angle: 60degClose Focus in Ft: 5.25 ftPupil Distance: 58 - 75.5mmEye Relief: 15mmWater Resistance: 100 mbarNitrogen Filling: yesLength in -Inch: 5.6 inchWeight: 25.6 oz