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If you can get yourself a good quality Ball mount for your camera that will solve the issue of a crooked horizon. (you can also do it with a normal tripod head) You can align your camera in all sorts of ways with that.. Even if you do have a straight horizon it will eventually rotate a little eventually over time. If you are guiding with the autoguider and have the camera shooting away, don't worry the stars wont trail. You can pretty much shoot 90 degrees from your guidestar and you shouldn't have trailing. The things that may effect this is flexure or a misaligned mount. Depending on what focal length you are shooting on your camera, trailing shouldn't be noticeable anyway.
Look forward to seeing some results.
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