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Explore Scientific 40mm 68 degree field waterproof 2" eyepiece, EPWP6840-00
This new 68 degree 40mm Explore Scientific is a high-quality and physically-impressive low power wide field 2" eyepiece for the serious deep space explorer. It comes with an unusual benefit. It is O-ring sealed and nitrogen-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.
Many observers feel that a 68 degree field eyepiece like this Explore Scientific hits the ŭsweet spot" between the affordable, but ŭlooking down a tube" view of conventional 45ŭ-50 degree field eyepieces, and the full-immersion, but very expensive, observing experience of an ultra-wide field 82 degree or 100 degree eyepiece.
Because of its long focal length, he 2" 40mm Explore Scientific is at its best with telescopes having a focal ratio of f/6 or longer (an f/6 scope gives it a 6.67mm exit pupil, about the largest most observers can fully utilize). A shorter focal ratio will waste some of your scopeŭs light gathering capacity when used with the 40mm Explore Scientific. If your scopeŭs focal ratio is f/6 or above, however, this wide field eyepiece can give you some truly excellent ŭbig picture" views of deep space. It is ideal for observing galaxy clusters, large emission and reflection nebulas, and nebula remnants ŭ no matter what your telescope type, as long as your telescope has a focal ratio of f/6 and longer. You can use the calculator below to see just how wide the field will be with your particular scope.
With a huge 31mm of usable eye relief, the six lens/fully multicoated 40mm Explore Scientific can be used by eyeglass wearers with no vignetting of the field. The eyepiece has a soft fold-down rubber eyecup and comes with dust covers for both ends of the eyepiece.
The 68 degree Explore Scientific eyepieces will start shipping in August. They may be in short supply at first, so preorders will be shipped in sequence according to the date that we received your online or telephone order. Preorders will not be charged on your credit card until the eyepieces have been received and are ready to ship. We will post images as soon as they are available.
This individually serial numbered Explore Scientific eyepiece is backed by a limited one year warranty, which is extended to five years when the eyepiece warranty is registered with Explore Scientific within 60 days of purchase.
Field of view 68 degree
Eye Relief 31mm
Focal Length 40mm
Number of optical elements 6
Barrel Size 2"
Warranty 1 year
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