For that reason, it is usually best to start observing with your longest focal length (lowest power) eyepiece first and work your way up in magnification until the view starts to degrade, and then find the eyepiece that hits the sweet spot. Most of us are not privileged to live under such perfect sky conditions, and more often than not, it is far from perfect. When atmospheric seeing is poor, the turbulent air will blur the view and cause the moon and planets to look wobbly: Atmospheric seeing is how still or unsettled the atmosphere around you is. This number is the Maximum Useful Magnification, assuming your sky conditions (atmospheric seeing) are perfect.
Therefore, if your telescope has a focal length of 2000mm, you can use up to a 5mm focal length eyepiece. So, for example, if you have a telescope with an aperture of 200mm (8"), your Maximum Useful Magnification is 400x. You can also take the aperture in inches and multiply it by 50 to get the same result. Maximum Useful Magnification = Telescope Aperture (mm) x 2 There is a simple formula to determine the Maximum Useful Magnification of your telescope: This is known as Maximum Useful Magnification, and you may see this as a specification on telescopes. Your telescope's aperture is the main factor in what decides how much magnification you can use. This is limited by two factors: 1) your telescope's aperture, and 2) the conditions of the sky when you're observing. But why is that? Telescopes have a limit of how much magnification they can provide when paired with an eyepiece. You might have already concluded that a smaller telescope won't give as magnified of a view as a larger one. How Your Telescope and Sky Conditions Affect Magnification The reason being is that the telescope gathers a fixed amount of light, and at higher magnifications, the same amount of light is being spread over a larger area, resulting in a dimmer image. Note: When using your telescope at different powers, you generally have a choice of a small, sharp, and bright image at lower magnification or a larger, yet blurred and dim image at higher magnification. A 20mm eyepiece on a 2000mm telescope (2000 / 20) gives you 100 power (100x), this makes objects appear 100 times closer to you through the telescope than they appear to your unaided eye.Magnification = Telescope Focal Length (mm) / Eyepiece Focal Length (mm)
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