Dennis, that's a great result you've achieved by a novel way of creating a very long focal length. Haven't seen a shot of the moon done with two teleconverters attached to a telephoto lens on this forum before. The result is testimony to the quality of both Canon EF lenses and teleconverters. I expected to see some CA doing it this way but there doesn't appear to be any. You must have had a good tripod too, as there is very little camera shake at 1/100th of a second. Your colour balance needs some adjusting, it's a bit too yellow on my screen but other than that, it's a fine effort. Well done!
