![]() This is an excellent magnification for planetary and close-up lunar observing, particularly when the high contrast of the eyepiece (rivaling that of orthoscopics and Brandons) is combined with its excellent color fidelity. On an 8" f/10 catadioptric, for example, it yields 167x. It is also quite remarkable for medium high magnification observing with long focal length refractors, reflectors, or catadioptric scopes. ![]() Its sharpness and lack of astigmatism across the field make globular clusters sharp, vivid, and nearly three-dimensional. Both fit nicely into its 1.67° field with the AT72ED, with a framework of black sky around the clusters to set them off. This is well suited for observing globular clusters such as M13 and M22. With the 430mm focal length Astro-Tech AT72ED, for example, its six lens/four group multicoated dual ED (Extra-low Dispersion) glass optics provide 36x and a field over three times as wide as the full Moon. With a short focal length refractor it is a low power eyepiece. (Rain, snow, or fog might limit its usefulness, however.) This medium focal length Astro-Tech 12mm Paradigm Dual ED eyepiece is usable with any telescope type, under virtually any seeing conditions - from fair to superb.
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