| This medium focal length TeleVue Radian eyepiece is usable with any scope type, under virtually any seeing conditions – from fair to superb. (Rain, snow, or fog might limit its usefulness, however.) With short focal length refractors, such as the TeleVues, it’s into the low power range. With the 540mm focal length NP-101, for example, it provides 45x and a field almost three times as wide as the Moon. This is well suited for observing open clusters such as the Pleiades and large nebulas such as the Lagoon. Both will fit nicely into its 1.33 degree field with the NP-101, with a framework of black sky around them to set them off. It is also excellent for medium high magnification observing with long focal length refractors, reflectors, or catadioptric scopes. On a 7” Maksutov, for example, it yields 222x. This is an excellent magnification for planetary and close-up lunar observing, particularly when the high contrast of the eyepiece is combined with the high contrast of the Maksutov. Its performance makes it a much better choice as a second eyepiece than merely doubling the power of most scopes’ standard 25-26mm eyepiece with a Barlow. |
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