Explore Scientific 82 Degree Waterproof

Description The 18mm 82° Series Waterproof Argon-Purged Eyepiece is a popular focal length in the upper-medium power magnification class providing both super-wide apparent field and generous eye relief. It is perfect for any application where more power is desired including observing globular star clusters, planetary nebulae, the bright cloud structure near the nucleus of comets, initial observations of planets, and (with the proper safe filtration on your telescope), observations of active regions of the sun. Use with Explore Scientific Focal Extenders for 2X, 3X, or 5X magnification increases while maintaining the eyepiece native apparent field and eye relief. Using advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable enhanced multilayer deposition (EMD) coatings, Explore Scientific 82° Series super 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. Your eye is relaxed, allowing you to easily use the “averted vision” technique to study faint details across a huge field-of-view. Each 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 are flat black, as well as the edges of the lenses themselves to minimize the scattering of light within the lenses themselves. 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. Specs Item Number EPWP8218–01 Focal Length 18mm Length 89mm Width 56mm Weight 13.7oz; 390g Barrel Size 2.00" Eye Relief 13mm Field Stop Diameter 25.3mm Warranty Limited Warranty is one year, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when product is registered within 60 days of purchase. Click Hereto register. Video Recommended Accessories: Astrozap 2” Eyepiece Heater Strap CA Residents: Prop 65 WARNING(S)

• VERSATILE MAGNIFICATION POWER: With its 18mm focal length, this waterproof eyepiece produces a versatile mid-range magnification that is an excellent choice for observing a broad range of objects from planets to deep sky favorites like nebulae, galaxies, star clusters and more. Under steady skies with excellent atmospheric conditions, fainter objects that cannot be seen with high magnification powers will be revealed in the eyepiece.
• BROAD FIELD OF VIEW: The wide 82-degree apparent field of view of this series of eyepieces makes it easier to locate objects in the night sky as well as explore various regions of large celestial treats like nebulae. The generous apparent field of view also relaxes your eye for a pleasant viewing experience and allows you to use averted vision to see fainter targets.
• HIGH RESOLUTION VIEWS WITH SHARP CONTRAST: This eyepiece generates brilliant views with crisp definition and rich contrast by using edge-blackened optical elements made of low-dispersion glass with a high refractive index. In addition, each lens element is fully multi-coated with durable enhanced multi-layer deposition (EMD) coatings that maximize light transmission.
• WATERPROOF HOUSING: Each 82-degree Series eyepiece is purged with an inert gas and O-ring sealed to create a waterproof environment that is impervious to internal moisture build-up and prevents contaminants like dust from entering the ocular housing.
• USA SUPPORT: Should you ever have an issue or question, you can always be assured of excellent support from our Customer Service team based in Springdale, Arkansas, USA.

Shipping Note: Shipping to Alaska, Hawaii, PO Boxes, and APO addresses is not available for this item

Warranty: 90 Day Woot Limited Warranty