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I've noticed that the only way I can capture stars without streaking is shooting an exposure of 2.5 seconds or less. If I use a longer exposure nothing in the sky is sharp. I first noticed on an RF 35 1.8 and the other night on an EF 100-400L f4.5 approximately 100mm focal length) mechanical shutter. Is there a trick or something I'm missing on long exposures?
