This is a very good quality medium power eyepiece for lunar observing, resolving globular clusters, picking up detail in emission and reflection nebulas, etc. It has a rubber grip ring for a comfortable grip in cold weather. It provides an almost 4.5mm exit pupil with an f/4.5 Dobsonian reflector for rich field scanning of the Milky Way star clouds in Sagittarius. It's an excellent choice to complement the 40mm eyepiece provided with some go-to Schmidt-Cassegrains. It will work well with any telescope type, at any focal ratio, under any seeing conditions. It has somewhat short eye relief that will limit the wide field for eyeglass wearers. Those who don’t wear glasses should have no problem seeing the entire field in comfort. It is parfocal with other Series 4000 eyepieces except the 14mm UWA, 32mm and 40mm SWA, and 40mm and 56mm Plössls.
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