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Price: ($199.99) ($199.99)

(as of 2013-04-18 02:06:42 PST)

Category: Telescope Accessories

Explore Scientific 24mm 68 Degree Series Argon-Purged Waterproof Eyepiece EPWP6824-01 by Explore Scientific

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Explore Scientific

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  • Field of view – 68 degree
  • Eye Relief – 18mm
  • Focal Length – 24mm
  • Number of optical elements – 6
  • Barrel Size – 1.25″


This new 68 degree 24mm Explore Scientific is an excellent low to medium power wide field eyepiece 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.

While the 24mm Explore Scientific is particularly well-suited to observing with Dobsonian reflectors and fast focal ratio refractors (it provides a big 5.3mm exit pupil for rich field observing on an f/4.5 Dobsonian, for example), it provides “picture window onto space” images with any telescope type and is a superb eyepiece to replace the so-so 25mm or 26mm that is usually supplied as standard equipment with many new scopes.

You can use the calculator below to see just how wide the field will be with your particular telescope. For example, it will give you a 1.43 degree field at 48x with a 10″ f/4.5 Dobsonian, more than enough to take in all of the Pleiades at one time. This gives you over five and a half minutes of uninterrupted observing with such a scope while an object drifts from one side of the eyepiece's flat field to the other. That's plenty of time for multiple observers to look at the same object, or for you to absorb as much detail as possible, before having to reposition the scope.

The eye relief of this six lens/fully multicoated optical system is 18mm, foe essentially unvignetted views for those with severe astigmatism who must wear eyeglasses while observing. The eyepiece has a soft fold-down rubber


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