Vixen 42mm Lanthanum Wide Series 2" Wide Angle Eyepiece with 72 Degree Field of View & Long Eye Relief.
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Vixen Lanthanum Superwides ..The most pleasant surprise is that they show sharp, contrasty views across nearly the entire field, even through fast-focal-ratio instruments. These LVW wide lenses are among the best values in quality wide-angle eyepieces. With extra-long 20mm eye-relief, an excellent field of view, and an Eyeball-filling, 65° wide-field,(72 deg. for 42mm) these 8-element-5-group Quality Optics made of Lanthanum, a rare earth glass which helps in holding aberrations to a minimum, will give you a great buy!