Explore Scientific 120 Degree 9mm Argon-Purged Waterproof Eyepiece, 2" Barrel

Through computer-optimized design, a careful selection of optical glasses and enhanced multi-layer deposition coatings, the Explore Scientific 120deg. 9mm Argon-Purged Waterproof Eyepiece produces long eye-relief and ensures high image-correction, a flat field and high contrast across the entire image field. An excellent choice for those who make extended visual studies of detail with subtle variations of brightness and for those who must wear glasses while observing.This eyepiece is meticulously assembled into precision machined metal lens barrels that maintain the perfect alignment of the optical train for years of rugged use in the field. To keep internal reflections to a minimum, all internal surfaces of the eyepiece barrel as well as the edges of the lenses are flat black to minimize the scattering of light within the lenses themselves.