Question for anyone regarding Milky Way photography...a Facebook friend and his son were out last night in an area where someone was taking 3-minute exposures of the Andromeda Galaxy and the ring nebula in Lyra. He said the photographer had a computer connected to his camera where he could track any movement of the stars. Supposedly his 3-minute exposures weren't to have any movement. I was under the impression anything that long would record as slight star trails. Does anyone know how long you can take night exposures without star movement?
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Moab Man could you please weigh in?