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.