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You also have to keep in mind the atmospheric seeing. This refers to the turbulance caused by layers of air in our atmosphere moving in different directions and velocities. On most nights, you might find the image degrade as you increase magnification, this is because you are also magnifying the turbulance caused by the atmosphere and you'll end up with a fuzzy or "boiling" image. Some nights, you'll see this effect at only 100-150x, yet on other nights you can go double that and still get a good image when the atmosphere is stable.
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