![]() Have little to no chromatic aberration, depending on the quality of the glass used Have little to no chromatic aberration, depending on the quality of the glass used Usually have heavy chromatic aberration, unless made with good glass Some quadruplets are designed for imaging only We dive deeper into the differences between doublets, triplets, and quadruplets further below, but here's a quick overview: Doublet Refractors Each of these is a type of optical design, which is a refractor's most important trait. Doublet, triplet, and quadruplet simply refers to the number of glass lens elements inside the telescope that bring the light into focus, and each one of these types has their own pros and cons. ![]() You'll often hear terms like doublet, triplet, and quadruplet (or Petzval) used to describe refractor telescopes. No matter what skill level you are or what your budget is, the refractor design is a tried and true telescope choice for almost everyone. Entry-level refractors are preferred for their ease of use and affordability. High-quality refractors are prized for their high contrast, aberration-free views and images. Refractors are the original telescope design, and are popular with beginners and advanced users alike. Refractor telescopes use glass lenses to bring an image into focus.
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