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Home > Glossary > Telescopes > Optics > Type of build

Telescopes Optics Type of build

Describes the exact structure of the telescope thereby further subdividing the different types of telescope.

Mirror telescope or refracting telescope? Schmidt-Cassegrain or Maksutov? Anyone faced with these agonizing questions before buying a telescope needs to find out about the advantages and disadvantages of the different construction types.

Refracting telescope:

  • Fraunhofer Achromat: classic principle of a refractor, but with chromatic aberration.
  • ED Apochromatic: two- or three lens refractor with an ED lens that reduces the most chromatic aberration and ensures maximum contrast. Among these refractors there are also some very well-corrected three lens optics that correct chromatic aberration and field curvature and so are very good for astrophotography.

Reflector mirror telescope

  • Newtonian Reflector: classic telescope named after Isaac Newton with a main mirror and a secondary mirror. Simple and proven system.
  • Maksutov Cassegrain: system consists of a main mirror and a secondary mirror, and a meniscus correction lens.
  • Schmidt-Cassegrain: similar to the Maksutov, but instead of the correction lens a Schmidt plate sits in front of the optics in order to correct chromatic aberration.

More information:

  • ACF-Cassegrain
    Meade's ACF optical design eliminates the typical aberrations of all mirror optics.
  • EdgeHD-Cassegrain
    Celestron’s aplanatic EdgeHD optics revolutionized astroimaging.
  • Newton
    Reflector telescope with a secondary mirror at the beginning of the tube which redirects light to one side.
  • 01.04.2020


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