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Message: <blockquote data-quote="stephenB" data-source="post: 1543714" data-attributes="member: 23668">Thats pretty conclusive! I wonder if the difference between your images and my graphs can be due to your showing pictures at the same size, not on a constant pixel scale? If there are more pixels on the 50D images than for the 40D, then maybe there could be a certain amount of averaging going on either in the eye when viewing them, or in whatever has been used to scale them to the same size. This averaging will reduce apparent noise levels.My noise analysis has of course been applied on 1:1 pixel level on all images. Also I dont have Lightroom, I just use PSE 6 and ACR. But surely that wouldnt make much difference?</blockquote>