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Simplest Star Trail photo, Reg, is to set camera to "B", point at south celestial pole from tripod, press shutter and keep it open for minutes to hours. If electronic shutter, be careful batteries don't go flat - use an AC adapter. Some shutters (my old film ones) can be locked open, but easier to use a shutter release cable and lock it open - to avoid shaking the camera after shutter is open. Modern digital cameras - I don't know how it is done.
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