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5D III, 300L f2.8, 1.4x, ISO 1600, 1/3 second, f5.6Lovely shot Keith!
Dramatic Full Moon rise 25 Feb 2013 © Keith Breazeal by Keith Breazeal Photography, on Flickr
Since you have a 5DIII, why don't you load MagicLantern and use the dual ISO feature for shots like this. That way you could expose for the moon and the landscape in a single shot.