Explore Scientific 68 Degree 20mm Argon-Purged Waterproof Telescope Eyepiece

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Explore Scientific 68 Degree 20mm Argon-Purged Waterproof Telescope Eyepiece

Regular Price: US$414.99

Special Price US$374.99

Availability: In stock

Supplier: Explore Scientific

Category: Electronics Camera & Photo Accessories Telescope & Microscope Accessories Telescope Accessories Eyepieces

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68 Degree Eyepiece Family

Using advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings, Explore Scientific 68° Series Argon-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 68° apparent field is truly a full-immersion experience. The 68° Series eyepieces are parfocal (meaning they focus at near the same point regardless of the focal length you select) and come with a removable 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.

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Protection from the Outdoors

By making the eyepiece body Argon-purged, the waterproof eyepiece internal elements will remain as pristine as the day they were assembled.

Argon atoms are larger than that of Nitrogen and therefore they are less likely to leak or diffuse their way through the seals over the life of the eyepiece. The atomic radius of Argon is larger than Nitrogen by 0.13 angstroms and has a larger atomic volume by 11.2 cubic centimeters/molecule. Argon also has superior inertness vs Nitrogen (i.e. forming few or no chemical compounds with other elements) that prevents adverse reactions with eyepiece components and therefore extends the longevity of the internal components, and also prevents chemical reactions with other elemental contaminants that may be introduced through a weakened seal. And, finally because Argon is less conductive of heat than Nitrogen, Argon cools slower thereby buffering the effects of rapid temperature changes of the optics.

The sealed, dry environment is impervious to internal fogging and contaminants getting 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.


	68 Degree 16mm Eyepiece	68 Degree 20mm Eyepiece	68 Degree 24mm Eyepiece
Item Number	EPWP6816–01	EPWP6820–01	EPWP6824–01
Focal Length	16mm	20mm	24mm
Length	61.9mm	69.6mm	75.6mm
Width	43.2mm	50.3mm	56.2mm
Weight	5.5oz; 158g	8.7oz; 247g	11.6oz; 329g
Barrel Size	1.25"	1.25-inch	1.25"
Eye Relief	11.9mm	15.3mm	18.4mm
Field Stop Diameter	18.2mm	22.8mm	27.2mm


	68 Degree 28mm Eyepiece	68 Degree 34mm Eyepiece	68 Degree 40mm Eyepiece
Item Number	EPWP6828–01	EPWP6834–01	EPWP6840–01
Focal Length	28mm	34mm	40mm
Length	91.4mm	100.8mm	114.2mm
Width	61.3mm	69.6mm	80.3mm
Weight	16.1oz; 458g	24.1oz; 685g	35.2oz; 998g
Barrel Size	2.00"	2.00"	2.00"
Eye Relief	21.6mm	26.4mm	31mm
Field Stop Diameter	31.8mm	38.6mm	45.5mm

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We offer other eyepieces with a variety of Field of View degrees and Focal Lengths

To discover what magnification you will have with a given eyepiece you must know two numbers. First, take your telescope's focal length in millimeters, and divide this number by the focal length of your eyepiece (this will be written in millimeters on the eyepiece).


	52 degree eyepiece family	62 degree eyepiece family	82 Degree Eyepiece Family	92 Degree Eyepiece Family	100 degree eyepiece family
FOV	52 Degrees	62 Degrees	82 Degrees	92 Degrees	100 Degrees

About Us

Based out of Springdale, Arkansas, Explore Scientific is an optics company that has been on a mission for the last decade to provide enthusiasts of all skill levels the tools and guidance they need to explore the skies above and the world around. The company is involved in designing, manufacturing, marketing, selling and distributing high-quality observation instruments and accessories such as telescopes, eyepieces, microscopes and binoculars.

Field Stop Diameter 22.8mm. Eye Relief 15.3mm. Barrel Size 1.25-inch. Length 69.6mm Width 50.3mm Weight 8.7oz; 247g. Focal Length 20mm.

Model Name: EPWP6820-01. Lens Fixed Focal Length: 20 Millimeters. Focus Type: Manual Focus. Lens Design: Prime. Minimum Focal Length: 20 Millimeters. Maximum Focal Length: 20 Millimeters. Camera Lens Description: 20 millimetres. Focal Length Description: 20 millimeters. Brand: Explore Scientific. Country of Origin: China. Manufacturer: JOC. Date First Available: June 18, 2012. Is Discontinued By Manufacturer: No. Best Sellers Rank: #6 in Telescope Eyepieces. Customer Reviews: 4.7 out of 5 stars 66 ratings 4.7 out of 5 stars. Item model number: EPWP6820-01. : B005SHQ0FY. Item Weight: 8.7 ounces. Product Dimensions: 1.98 x 1.98 x 2.74 inches.