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Doublet Refracting Telescopes, or Doublets, as they are commonly referred to, are simply just refractors that use 2 lenses to get a cleaner and more precise view. These telescopes can also be classified as apochromatic or achromatic depending on the scope itself. These are generally the type of telescopes that you might see at your local sporting goods store because of their cheaper price tag. They also make for great beginner telescopes due to their ease of use, light weight, and low cost.