Nikon WX 7x50 IF BinocularThe Nikon WX 7x50 IF Binoculars bring amazing optical performance to their astronomy binoculars. These individual focus optics have a 10. 7 actual field of view, and their field flattener lens system maintains sharp focus across the entire field. Three Extra low Dispersion (ED) glass elements for each eye eliminates chromatic aberration to the edge of the image, while high quality multi layer lens and prism coatings and the use of Abbe Koenig prisms