One last item on my high ISO kick. I went back to Lightroom to find the photograph with the highest ISO setting. Today's photo was taken in Iceland in 2015 with my Canon 5D Mk III. Shutter was 1/30 at f/4. ISO was 16,000. Looking closely I could see some noise, but moving the noise reduction slider to about 54 gave a good clean picture. I think the camera was set to standard noise reduction. I am going to ruminate a little on where to keep the cameras set with respect to noise reduction. I have had them all set on Standard for many years. Maybe I should just leave well enough alone.