GWguy
*
It's cold tonight but i gave it one more try. Went in "live view" and magnified X10 and with the tripod locked tight i could still see the moon moving. I think this is the moon moving in the sky, not the camera on the tripod since it is a fairly heavy duty unit. The pictures did turn out better then last night. For a few i also upped the ISO to 200 which let me get the shutter speed up to 400. This was still at 300mm and a 75% crop.
Nice. I don't think it's the moon moving (contrary to my previous post.... ) Your shutter speed of 400 will arrest that little bit of motion.
Who's lens are you using? The lens it self may be "soft" and it shows up at high magnifications.