| This short focal length (but physically long) parfocal Celestron X-Cel eyepiece is an economical choice for high quality high magnification observing with long focal length refractors, reflectors, or catadioptric scopes under good to somewhat better than average seeing conditions. Long eye relief makes it a good choice for those who must wear eyeglasses while observing. A low price makes it a fiscally sound choice for all observers. Its five-layer fully multicoated six-element ED (extra-low dispersion) glass optical design is also quite good for medium power viewing with short focal length refractors and fast focal ratio Dobsonian reflectors. Good contrast makes it a sensible choice for resolving detail in planets and planetary nebulas, while its edge-to-edge sharpness makes smaller globular clusters vivid and nearly three-dimensional. It is more or less regularly useful with long focal length scopes, but below average seeing conditions may limit its performance. If so-so seeing is the norm where you observe, its 8mm focal length may represent the maximum practical with a long focal length telescope. 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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