This is a very good quality medium to low power (depending on the focal length of your telescope) eyepiece for lunar observing, viewing emission and reflection nebulas in their entirety, etc. It provides a big 5.8mm 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 26mm eyepiece that comes with many moderately-priced telescopes. 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. It will work well with any telescope type, at any focal ratio.
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