Fletch, I don't believe I ever said that ISO is not ISO, is not ISO. We all know that ISO is a standard, and obviously, ISO 100 in one camera is theoretically the same as ISO 100 in another camera. What adjusting the ISO up or down in your camera does is making the sensor more, or less sensitive to light. Because of the physical constraints of smaller pixel sizes having less light grabbing qualities, the micro in that camera may have to auto adjust the ISO sensitivity up in order to grab enough light to properly expose the image. In that same scenario, a sensor with larger, more sensitive light grabbing pixels may be able shoot the same shot at, let's say 100 ISO instead of 200 ISO, and also properly expose the image at that setting.
What I'm talking about is the difference between one cameras ability to process light vs another cameras ability...in the camera body, the difference is usually based upon the performance of it's electronics.
And Finally...I know that ISO is ISO is ISO
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