Instead, try using full manual mode. By taking control of the settings, I was able to properly expose just the moon. To do this, I changed my metering mode to Spot Metering. I also set my ISO to 400 to increase my shutter speed and reduce the chance of camera shake. I stuck with an aperture of F-5.6 which gave me a shutter speed of 1/500th of a second. Also, with this speed, there is no need for a tripod.