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| This is a good medium to low power (depending on the focal length of your telescope) long eye relief eyepiece for lunar observing, viewing emission and reflection nebulas in their entirety, etc. It provides a big 5.55mm exit pupil with an f/4.5 Dobsonian reflector for rich field scanning of the Milky Way star clouds in Sagittarius from a dark sky site. An excellent choice to replace the so-so 25mm or 26mm eyepiece that comes with many moderately-priced scopes. Its five-layer multicoated ED (extra-low dispersion) glass six-element optics provide high contrast, making it a good eyepiece for observing galaxy clusters, framing the more compact emission nebulas with the black of space, observing the nebulosity around the Pleiades, etc. It’s a good choice to complement the 40mm eyepiece provided with some go-to Schmidt-Cassegrains. A soft rubber eyecup on this parfocal eyepiece 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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