Assertion: plössl eyepiece | /r/HasAspect | four lens elements
Facets:
Source sentences:
text: Plössl eyepieces, which have four lens elements, for example, are not recommended for fast telescopes (f/5 or lower) or Dobsonians.
text: Plössl eyepieces are good all-around performers, producing sharp images at the center of the field, but they have only four lens elements.