This is a very good quality low power/wide field eyepiece for lunar observing, capturing galaxy clusters, viewing emission and reflection nebulas in their entirety, etc. You can use the calculator below to see how wide a field it will give you with your particular scope. It provides a big 7.1mm 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. As the eyes of some observers may no longer be able to dilate to a full 7mm, however, this eyepiece could potentially waste some of the light-gathering capability of a fast focal ratio scope. Thought should be given to matching its exit pupil size to your eyesight before purchasing if you have a fast focal ratio scope, unless you are content to give up some light gathering in exchange for a wider view of the universe. This is an excellent choice to replace the so-so 26mm eyepiece that comes with many moderately-priced scopes, not only to improve the edge-to-edge sharpness, but to give a wider and brighter field of view, as well. 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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