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Your high power eyepiece will never give a clear view, it will always look a little off, this is due to the atmospherics being maginifed as well.
On really good nights, there will be a increase in sharpness, but still nothing grand.
Medium and low power should bring sharp images.
When you focus on a star, does it come to a point, or is the light streaking in one direction more than other directions.
Another thing to check, when the star is out of focus just a little, is the rings concetric with the other rings and the spot in the middle ?. Or does it flare in one direction ?.
Theo.
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