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The settings assistance in ASPS. You will need an image (Preferably FITS) taken with your setup, you first pull some data from the image in the settings assistant, then it sends you to solve the same file with astrometry.net online, after which you copy some data from that solved image into the settings assistant to calculate your precise focal length. Then you can use THAT as your focal length in APT or other imaging software for when it calls on ASPS.
I have not used APT for some time but I am sure you can also do a plate solve (Blind solve or near solve) and sync the mount to that from within APT.
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