Katena’s Diamond series of reusable lenses feature a patent pending optical design at an extraordinary value. Each lens possesses high performance multi-layer anti-reflective and hard coatings. An ultralight metallic alloy with silicone grip makes each lens ergonomically friendly. These lenses offer exceptional small pupil performance and low image distortion. Sold individually. This reusable 78D lens provides an image magnification of 0.77x and a field of view of 80°.