CamcorderInfo ran some tests on the 500-8000 ISO images that Red Digital Cinema posted on a forum the other day using a custom software designed to analyze images from cameras and camcorders. As you can see for yourself in the images, the noise levels were amazingly low, and the tests backed that up. The color readings were a different story, but before you judge too quickly, take a quick look at the caveats posted over at FresHDV, then read the comparison.
