Daylight was fading. I changed the color balance from ‘auto white balance’ to ‘daylight’ in order to preserve the twilight effect. There is a button on the back of the camera that makes this a relatively quick adjustment. Exposed at ISO 200, f2.2 at 1/40th of a second. My feeling is that the camera meter under exposed this by about 1/2 stop. However, there are several metering modes, and I may not have used the optimal setting for this difficult lighting situation. My feeling is that working with a camera in low light tells more about its capabilities than just using it in bright sun.