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Hi,
I can think of 3 possibilities:
1) Too much magnification. When pushing the scope at high mag it is hard to focus. Start out with a low power eyepiece such as a 32mm or 25mm etc.
2) Finder scope not properly aligned. It is possible that your finder scope is not lined up with your main scope. Take the scope out in the day and line the finder scope up with the main scope by using a distant object such as a radio tower etc. There should be screws on the sides of the finder scope that you can use to make the necessary adjustments.
3) Cullmination. If your main mirror is not properly allinged with the secondary mirror you will have a problem in focusing etc. This should be covered in you manual.
I hope this helps...
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