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This Explore Scientific 2"40mm 68 degree Series Argon-Purged Waterproof eyepiece is in excellent shape. Has flip down rubber eye guard and both original end caps. A beautiful eyepiece, or weapon.

Eyepiece Series Explore Scientific 68° Argon-Purged Waterproof SeriesFocal Length 40mmBarrel Size 2" (50.8mm)Apparent Field of View (Mfg Specified) 68°Eye Relief (Designed) 31mmFilter Threads Standard 2" Filter Thread (M48 x 0.75)Coatings EMD (Enhanced Multilayer Deposition) CoatingsLens Elements 6Lens Groups 4Blackened Lens Edges YesBarrel Type Tapered barrelOptical Design 6 Elements; Combination of: Dense Crown, Light Crown, Dense Flint, and Lanthanum Optical GlassesEnd Caps 2Parfocal YesRubber Eye Guard Rubber Folding TypeWeight 2lb - 3ozCountry of Manufacture ChinaMisc. Information Body: Anodized Black Aluminum; Laser-Etched Description and Serial Number; Rubber Grip: Internally O-Ring Sealed and Argon Purged
Barrel: Stainless-Steel, Double Taper, Accepts Standard FiltersThrough computer-optimized design, a careful selection of optical glasses, and enhanced multi-layer deposition coatings, the Explore Scientific 68° Series eyepieces produce long eye-relief and ensure high image-correction, a flat field, and high contrast across the entire image field. An excellent choice for those who make extended visual studies of detail with subtle variations of brightness, and for those who must wear glasses while observing.
With the introduction of the 68° Series, Explore Scientific has made two important improvements in eyepiece manufacture - the first being 15 layer Enhanced Multi-layer Deposition (EMD) coatings on all glass-to-air surfaces to gain maximum contrast, and waterproofing the eyepiece with the use of Argon gas purging instead of standard Nitrogen gas. Although Nitrogen is a fine choice that will last for many years, Argon is a larger molecule that maintains its protective properties over a wider range of temperatures, and is even more resistant to diffusion thereby further extending the protective waterproof environment of the eyepiece body.
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 Scientific's eyepieces are backed with their exclusive Explore STAR Transferrable Extended Life of the Product Warranty. Limited Warranty is one year, which converts to the Explore STAR Transferrable Extended Life of the Product Warranty when product is registered within 60 days of purchase. We think that you will find Explore Scientific eyepieces rank among the finest obtainable and represent an outstanding value.

Filed under: Eyepieces & Accessories