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Interesting shot... I like it, but id like to see it a bit more sharp whether that require post production or not. The noise is most likely caused from such a long exposure although 5 seconds isn't really that long. The noise isn't that noticeable at the size posted though.
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Nikon D90 18-105mm VR Portfolio: http://www.wix.com/JMarro/JMarro-Photo-Portfolio Flickr: http://www.flickr.com/photos/40900178@N02/ |
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There is a article on the signal to noise ratio and it's effects on sensors in this months "Digital Photo Pro" magazine. Just a excerpt from it. The noise level goes up in areas that are dark due to the snr drop. As in the noise level is more apparent because there is less signal. All sensors have a "noise floor" and all have a base level. Normally this is overcome by the signal but in dark photographs there is less signal to overpower the noise. My suggestion is to move your histogram toward the right and by doing so clipping off the noise at the dark end. You can do this a couple of ways. Working the capture from RAW is the easiest. There are books on low light/available light photography. The one I have is dated before the digital revolution but the processes are the same within reason.
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