The frontier ed 8x42 binoculars sit in hawkes nature series and feature phase corrected prisms and a high performance ed glass optical system in a magnesium alloy open hinge body the ed glass multi coated optics and phase corrected prisms increases performance and enhances light transmission to deliver a clear bright viewing experience the smooth focus knob with a 17 full turn mechanism fits neatly within easy reach and operates well even with gloved hands the open hinge cut away design