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I'll confirm Peter, collimating the CDK12.5 by eye, that is, assessing full frame images in focus, and slightly out of focus is the way to go. If your scope was poorly assembled, like many of these seem to be, the tak scope will not work until it is assembled accurately. Most importantly, that your secondary is in perfect alignment to the focusers optical axis. That does not mean middle of the front ring.
Good luck, as once you eventually achieve collimation, you will be rewarded by excellent images.
Steve
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