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If you use NINA, there's a plugin (plugins are excellent!) you can download called Hocus Focus. Not only is it the best autofocuser out there, but it comes with an aberration inspector that can tell you how much your backfocus needs adjusting and how bad your tilt is and in which direction.
For the 2600s, they come with a tilt adjustment plate which you can play with using the tilt adjustment screws to push/pull three points to fix your tilt, once you know which side is impacted.
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