This is a discontinued item. We recommend the Explore Scientific 18mm 82° Argon Purged Waterproof 2" Eyepiece as a replacement.
Explore Scientific 18mm 82° Nitrogen-Purged Waterproof Eyepiece - 2"
Using advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings, Explore Scientific 82° Series Nitrogen-Purged Waterproof extreme wide field eyepieces are optimized to produce high contrast, high resolution, and superior flat field characteristics. The visual effect of these eyepieces with their long eye-relief and their 82° apparent field is truly a full-immersion experience. The 82° Series eyepieces come with a removeable and foldable soft silicone rubber eyecup for the comfort of the observer, and as experienced astronomers know, eye comfort is critical when trying to observe at the visual limits of the telescope.
Protection from the Outdoors - By making the eyepiece body gas-purged and waterproof eyepiece internal elements will remain as pristine as the day they were assembled. The sealed, dry environment is impervious to internal fogging and contaminants such as fungus growing in between the lens elements. Our waterproof eyepiece is easier to clean, and there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements. To insure a perfect seal we test every eyepiece in one meter of water for 30 minutes.
Explore Ultra-Wide Eyepieces - Comfort, Quality, Value
Optimized Optical Design - Explore 82° Series ultra-wide eyepieces are optimized through each design, fabrication, and testing process to produce flat-field images that have high contrast and resolution.
Exotic Glass Combinations for Optimum Results - Eyepieces are constructed of 6 or 7 lens elements (depending on the focal length) that are fabricated from combinations of Dense Crown, Light Crown, Dense Flint, and Lanthanum optical glass.
Durable Coatings & Finishing Touches - Each element in your Explore Scientific 82° eyepiece is fully multi-coated, resulting in bright, sharp images, and every element has blackened edges to reduce internal reflections and increase contrast.
Waterproof, Fog-Proof Housing - The internal optics of all 82° Series eyepieces are housed in a gas-purged, waterproof barrel that keeps them as pristine as the day they were manufactured. Cleaning is much easier, and there is no need to worry about water or fluid becoming trapped in between elements due to rain, spills, heavy dew, or getting over-enthusiastic with lens cleaning fluid.
Tapered Barrel for Extra Security - The insert barrel of each eyepiece is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder or diagonal, however the wide dimension of the taper helps prevent the eyepiece from falling out of the telescope should the set-screw holding it in place become loose. The barrel (1.25" or 2", depending on the focal length) is threaded to accept standard screw-on filters.
Optional Focal Extenders for Extra Magnification - Explore Scientific makes a wide variety of eyepiece focal lengths, allowing a change in magnification for just about any observational study you can think of. However, if you would like to get "double duty" out of the eyepieces in your accessory case, while still retaining the eye relief of that eyepiece, use Explore Scientific Focal Extenders.
|Name||Explore Scientific - 18mm 82° Nitrogen Purged Waterproof Eyepiece - 2"|
|Eyepiece Apparent FOV||82|
|Eyepiece Barrel Size||2"|
|Eyepiece Eye Relief||13|
|Eyepiece Focal Length||18|
|Warranty||Explore STAR Transferrable Unlimited Lifetime Product Warranty|