$ 649.99

Description

Field of view - 68 degree.
Eye - 31mm.
Focal Length - 40mm.
Number of optical elements - 6.
Barrel Size - 2".

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 "sweet spot" between the affordable, but "looking down a tube" view of conventional 45 degree - 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 teles having a focal ratio of f/6 or longer (an f/6 gives it a 6.67mm exit pupil, about the largest most observers can fully utilize). A shorter focal ratio will waste some of your 's light gathering capacity when used with the 40mm Explore Scientific. If your 's focal ratio is f/6 or above, however, this wide field eyepiece can give you some truly excellent "big picture" views of deep space. It is ideal for observing galaxy clusters, large emission and reflection nebula, and nebula remnants no matter what your tele type, as long as your tele 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 . With a huge 31mm of usable eye , 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. This individually serial numbered Explore Scientific product is backed by a limited one year warranty

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Explore Scientific 68 Degree 40mm Argon-Purged Waterproof Tele Eyepiece

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