Glenn Chaple's observing basics: Eyepiece ABCs
January 2008: Since the 1960s, eyepieces have evolved to fit various observing needs.
Contributed by Glenn Chaple
Published:
January 1, 2008
Senior citizens often reminisce about how uncomplicated life was in the good old days. When it comes to amateur astronomy, they may have a point.
Consider eyepieces. Purchasing an eyepiece in the 1960s was easy, because you could choose from only a handful of basic designs. You could start out with a simple Ramsden or Huygens; or you might step up to a Kellner, or that crème de la crème of eyepieces, the orthoscopic. If you preferred an eye-pleasing wide-field view, you couldn't go wrong with an Erfle. |
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