This is as much "reach" that I can do with my current camera. I put both my 2x and my 1.4x on my 200mm lens. This is called "stacking." It isn't the sharpest picture I've ever seen of the moon, but it is the best I can do. I also used mirror lockup to eliminate any camera shake on the tripod. I don't think that I'll be able to take many "stacked" pictures in real life situations, but it was fun to try it on the moon.
Just in case you are wondering what the first picture is.....well, it's Saturn. Looks like a white dot to me, but Darwin assurred me that this is a planet. It is a disc, not a dot....for all you non-astronomy type people.