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I took some pictures last night in RAW with my Canon 700d which looked ok but when I tried to do a star trail picture it was just white. I put it onto bulb and set the intervalometer for 25 minutes. Is it because I didn't do continuous shooting? Should I have done 30 secs with an interval?


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Your 25 minute exposure was white because even though it was at taken night, the camera gathered so much light it was completely over-exposed.

As Davey-T suggests, look at some tutorials, the exposures have to be long enough for the stars to trail appreciably, but mot enough to burn out the sky,.


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Depending on other settings and sky conditions a 25min exposure will yield a white overexposed image, is it actually pure white, have you got some imaging software to measure pixel values ?


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