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I also use a 130mm scope, a reflector, and can use 216X on 9/10 nights with the loss of image quality outweighed by the increased image scale. At 108X the image is almost always sharp, bright and steady. On 50% of nights, higher magnification could be used if I had the necessary eyepieces. As mentioned before, altitude is also critical as is collimation. An object that looks great 70+ degrees up will be terrible just above the horizon.
Ralph
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