Quote:
Originally Posted by HenryNZ
It won't hold collimation and collimation changes with just slewing.
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A possible culprit is a problem with the main mirror mounting, either a loose locking nut or improperly applied mounting compound behind the mirror. You can check for any obvious movement by removing a vent and pressing on the back of the mirror with your finger. Celestron apparently went cheap in recent years and mixed soft foam balls with the mounting compound on at least some scopes - not usually an issue but the compound has been known to fall apart.