Explore Scientific 2" - 18 mm Argon Purged 82° Waterproof Eyepiece

Explore Scientific 18mm 82° Series Waterproof N2 Eyepiece - 2" * The Explore Scientific 82° Series Waterproof N2 Eyepieces is waterproof and nitrogen-purged, to ensure that the internal elements remain clean and dry. * Like all Explore Scientific eyepieces, it is optimized to produce high contrast, high resolution, and superior flat field. * This Explore Scientific 82° Series Waterproof N2 Eyepiece has an 18mm focal length and 2" barrel. * All internal surfaces of the eyepiece barrel are flat black, as well as the edges of the lenses themselves. * The Explore Scientific 82° Series Eyepieces provide a huge field-of-view and long eye relief by using advanced computer design, combinations of low dispersion and high refractive index optical glasses. * Precision machined metal lens barrels that maintain the perfect alignment of the optical train for years of rugged use in the field.

Explore Ultra-Wide Eyepieces - Comfort, Quality, Value. Explore Scientific 82° Series™ eyepieces, with their 82° apparent field of view, immerses you in a very comfortable ultra-wide field that naturally promotes relaxation at the eyepiece. When you relax your eyes and take in the scene presented before you, it is much easier to observe for longer periods of time, and details begin to materialize that may not have become apparent to you at first glance. Another great benefit of ultra-wide eyepieces is the ease with which you can gaze, not directly at an object, but slightly to either side. This skill, called using averted vision, is especially helpful when observing faint objects, because using averted vision puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter images.