This is not a scientific test at all. @geraldundone can do that for us! This is simply a low-light focus test using Canon's 24-105L & 17-55, and Sigma's 18-35mm lenses. I kept the focal length at 35mm and tried to maintain the same distance and exposure. In some cases I had to raise the ISO substantially to match in-camera exposure. I also made sure the Auto Focus Response Speed was at its default settings in the cameras. I used the on-board mics to record the sound the lenses make while focusing too. Listen to the difference. I think the C70 doesn't focus the same as the C200.
*This is NOT a color comparison test. I realized afterwards my temps were off. C200 is at 4550k +1 and the C70 is at 5600k +0.
