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If you have stars at the centre sharp, and they are out of focus at the edges - then you have a cheap lousy finderscope. Use it during daytime and you should see the same effect. I have a hopeless Seben one which sounds to be just like yours, if not worse.
It may still be useful for finding brighter objects, but the best course of action is to buy a better quality finderscope.
Regards,
Renato
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