According to the eyepieces, zenit prisms are the most important accessories for refractors and Schmidt-Cassegrain or Maksutov mirror telescopes. They are needed for a more comfortable insight with zenith observations or for reversing the image. For optical building reasons, these accessories cannot be used for Newton reflectors - and do not need it either, since the beaming in the Newton telescope makes it unnecessary. This zenit prism provides an upright, page -exchanged picture. All Celestron ZenitPrisma have high -quality remuneration.