About Explore Scientific's 100-degree Argon-purged Waterproof Eyepieces:
The Explore Scientific 100° Series eyepieces are hyper-wide class oculars that can transform your visual astronomy experience. You may be startled at the amazingly wide expanse of inky black sky you behold the first time you bring your eye to a 100° Series eyepiece, and after a while, you may even forget that you have an eyepiece between you and the universe! With an apparent field of view that is close to the maximum for hyper-wide eyepiece design, objects are not only easier to locate, but for non-driven telescopes the object will stay in the field of view for a very long time before any adjustments need to be made.
Another great benefit of hyper-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.
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 such as fungus growing in between the lens elements. Explore Scientific's 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, every eyepiece is tested in one meter of water for 30 minutes.
This kit includes a 100° 5.5mm, 100° 9mm and 100° 14mm Argon-purged waterproof eyepiece, along with a soft sided case. These eyepieces are individually boxed in Explore Scientific's Will Tirion "famous" star map box along with the soft-sided case inside an outer box.
|Apparent Field of View||100°|
|Barrel Size||5.5mm - 2", 9mm - 2" and 14mm - 2"|
|Coatings||EMD (Enhanced Multilayer Deposition) Coatings|
|Design||9 Elements; Combination of: Dense Crown, Light Crown, Dense Flint, and Lanthanum Optical Glasses|
|Eye Relief by Design||5.5mm - 12.5mm, 9mm - 12.5mm, and 14mm - 14.5mm|
|Rubber Eye Guard||Rubber Folding Type|
|Eyepiece Weight||21.20oz (601.01g)|
|Blackened Lens Edges||Yes|
|Eyepiece Focal Length||5.1mm - 10mm|
|Eyepiece Field of View||Over 80 degrees|
|Eyepiece Series||Explore Scientific 100°|
|Barrel Type||Tapered barrel|