Time to be with your loved ones

Time to be with loved ones

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Why do the 600D/7D sensors have more noise at high ISO than 5Dmk2 or 1Dmk4?

Hi I'm wondering why the high ISO performance in a 5Dmk2 or 1Dmk4 is so much better than a 600D or 7d? I've been trying to photograph the milky way galaxy and when I use an ISO of 6400 I have an ...