This 82° 14mm Explore Scientific is an exceptional medium focal length/ultra wide field eyepiece with an unusual benefit. It is O-ring sealed and argon-purged to be 100% waterproof. This prevents internal fogging in the eyepiece; keeps the interior dust-and fungus-free; and makes it easier to clean, as there is no risk of excess cleaning solution getting trapped between the lenses.
The latest computer design programs have been used to optimize its performance. Its seven element/four group design uses low dispersion and high refractive index lenses and full multicoatings for high contrast, high resolution, and flat field images across a very wide 82° field of view. The lens edges have been blackened to improve contrast.
The 14mm 82° Explore Scientific works with any type of telescope, from a fast focal ratio Dobsonian reflector to a long focal ratio achromatic refractor. Its wide field makes observing through it feel like you’re looking through a “picture window on space” rather than through an eyepiece, particularly with fast focal ratio/short focal length scopes such as fast apo refractors or Dobsonian reflectors.
A 10" f/4.5 Dobsonian reflector will have a 1° field at 82x with this eyepiece. This gives you a full four minutes to observe as an object drifts from one side of the sharp field of view to the other before you have to reposition the scope. A 4" f/7 refractor like the Explore Scientific 102mm will have a 1.6° field (over three times the diameter of the full Moon) at 51x. You can use the calculator in the "formula" tab above to see just how wide the field will be with your particular telescope.
At 15mm, the eye relief is surprisingly good, although eyeglass wearers will still see a somewhat vignetted image. This isn’t as much a problem as you might think, as the 82° field of view is so wide that even non-eyeglass wearers have trouble seeing the whole field at once. This is an eyepiece that shows you a “picture window view” of space for a true full-immersion observing experience. With its unconstricted view, your eye relaxes, allowing you to easily use the “averted vision” technique to study faint details across a huge field of view.
The eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.
This individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which will be extended to an Explore Scientific transferable lifetime limited warranty when its warranty card is registered with Explore Scientific within 60 days of purchase. Here's a link to full details on this unique transferable lifetime warranty.
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