This is a very good quality medium to medium high power eyepiece designed for observing lunar and planetary detail, resolving globular clusters, picking up small planetary nebulas against a stellar background, etc. It essentially doubles the power of the 25mm/26mm eyepiece that comes standard with most telescopes, so it is a good choice as a first additional eyepiece for those who do not have to wear eyeglasses when observing. It has a somewhat short eye relief that will limit the field for eyeglass wearers. Those who must wear eyeglasses while observing due to severe astigmatism would probably be better off using a Barlow and a longer focal length eyepiece with longer eye relief to reach this focal length, rather than buying this eyepiece for use on its own. 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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