Recommendations – The Best Telescope Eyepieces We Know But I think you will feel more confident about your purchases and be less likely to be disappointed if you read through the guide. If you just want the best eyepiece recommendations and don’t care about the details, I’m adding that section right below before we go into the specifications that answer the above questions and make use of the formulas. These are things you will want to know and use. Exit pupil = telescope focal ratio / focal length of eyepieceĭon’t worry about the math, as it’s simple stuff you can do with any calculator, on paper, or perhaps in your head.The maximum practical magnification of a telescope is typically 40-60x per inch of aperture, or 1.6-2.5x per mm.Focal ratio = focal length of telescope / aperture of telescope.True field of view, or FOV = Apparent field of view (AFOV) of the eyepiece / magnification.Magnification or power = focal length of telescope / focal length of eyepiece.How will my telescope’s focal ratio affect my purchases?.What apparent field of view and eye relief do I want?.What focal length eyepieces should I buy?.What diameter eyepieces will my telescope accept?.So, I am going to organize the guide around five questions and four formulas.Īs we go along, I will refer back to these, so don’t worry if you can’t answer the questions or understand the formulas now. I want to help you select the best eyepieces for your telescope and your budget. Most telescopes come with one or two eyepieces, which gives you one or two magnification options. However, if you want to optimize your viewing experience, you’ll need to invest in a better-quality eyepiece. By having a range of magnifications, you can optimize the image, which means you need more eyepieces.
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