With telescopes, we change magnification by changing eyepieces. Page 1 of 3 - Telescope highest useful magnification and eyepiece selection - posted in Eyepieces: Hi All. Under this magnification we begin to lose light, even though the apparent surface brightness does not change. I understand the basic differences between eyepiece type and use, but am trying to understand the zoom limits as they pertain to the scope I have. The lowest useful magnification is achieved with a 34mm focal length eyepiece. Equipment Telescope: X Axis Scale Exit Pupil Magnification Options Show Eyepieces with Multipliers Show Beyond Exit Pupil Limits Show Eyepieces with Multipliers Show Beyond Exit Pupil Limits My first post, my first scope, and Im looking at eyepieces for the first time. I picked up a Nester 6SE. Example: You use a telescope with a 1000mm focal length and a 10mm eyepiece. Chart plotted as a function of magnification. The breaking point on the chart shows magnification at which telescope's exit pupil equals to human eye pupil (6-7 mm). To determine the focal lengths of eyepieces that fall within the magnification limits, you must take the focal length and divide by the magnification. You will want a high magnification eyepiece for the moon and planets. Theoretically, one could increase the magnification ever higher. So, the smaller the number that you find on an eyepiece, the higher magnification it will provide. Magnification = Focal Length of the telescope ÷ by the focal length of the eyepiece. If, for example, you use a telescope with a 1000mm focal length and a 5mm eyepiece, you will get a magnification of 200 times. You will want a medium magnification eyepiece for brighter deep-sky objects (star clusters, nebulae and galaxies) or when you need to check for more detail in these objects. To understand this we must first understand the term Focal Length.. Focal Length. In this way, a 10mm eyepiece gives double the magnification of a 20mm eyepiece. Calculation of the true field of view (TFOV): TFOV = AFOV / magnification The magnification of the eyepiece in the telescope: M = focal length of telescope / focal length of eyepiece. If divide the focal length of the telescope (fob) by the focal length of the eyepiece (fok) you get the magnification achieved. https://lookatthesky.com/calculate-the-magnification-of-any-telescope Understanding how power, or magnification, is calculated when using a telescope will require the understanding of a relationship between two independent optical systems - the telescope itself and the eyepiece you are using. For the AstroMaster 130EQ, the highest useful magnification is achieved with a 2.1mm focal length eyepiece. V = fob / fok. 1000mm/10mm = 100X magnification. Now here is …
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