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Hi Jorge. I'm always interested in photo exposure problems and I have just this morning been reading about this very topic. The noise in an image is located within the black (left-hand) end of the histogram so it is best to have your image peak data away from that end. The recommended value is about 25% across from the left hand side. On this basis, all your images are in fact under-exposed. However the best of your set would be the 480sec at 200 ISO.
Hope this helps.
Robert
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