| This short focal length parfocal Celestron X-Cel eyepiece is a good choice for medium to medium high magnification observing with long focal length refractors, reflectors, or catadioptric scopes – even under average seeing conditions. Its 10mm focal length is ideal for an f/10 Schmidt-Cassegrain, providing a 1mm exit pupil that best matches the resolution of the scope to that of your eye. Combine that resolution with its good contrast due to its five-layer multicoated ED (extra-low dispersion) glass six-element design and you have an eyepiece that’s well-suited for lunar, planetary, and globular cluster observing with an SCT. (Some of the larger globulars, such as M13, will more than fill its 0.28 degree field with such a scope.) It is also very good for medium power viewing with short focal length refractors and fast focal ratio Dobsonian reflectors. Eyeglass wearers will find its long eye relief particularly attractive. And all observers will like its low price. A soft rubber eyecup shields the eye from ambient light and rolls down for more comfortable eyeglass use. A knurled rubber ring on the barrel provides a secure grip when changing eyepieces in cold weather.
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