![]() ![]() Other factors, such as price, aperture, focal length, focal ratio, glass used, focuser size and design, included accessories, and whether it's an achromatic or apochromatic (APO) design should play into your decision as well. It's worth noting that the refractor optical designs of doublet, triplet, and quadruplet aren't the only aspect to consider, particularly when buying a high-end refractor, especially for imaging. Finally, those looking for an out-of-the-box solution for astrophotography may prefer the built-in field flattener (which we cover under the Quadruplet Refractor section below) in a quadruplet refractor telescope. More experienced observers and imagers may prefer the optical qualities of a triplet APO refractor telescope. Click here to shop our wide selection of doublet refractor telescopes under $500. Requires use of a field flattener or flattener/reducer for most imaging purposesįor a beginner, a doublet refractor is more than adequate, especially if you're only planning to be visually observing. 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 your skill level or your budget, 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. In our helpful guide below, we explain the differences in layman's terms to help you decide. Refractor telescopes come in a wide range of sizes, prices, and quality levels, so it can be difficult to pick out which one is right for you.
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