Thanks for all contribution especially the links because it explaina so detail and carefully about my prob. I love those pics your guy posted. It's so nice anw. Maybe i should shoot faster because moon is always moving eventhough it doesnt move too fast from my viewpoint. The reason that i dont get closer to the moon is because i want to have tree and their leaves under moonlight captures in my pics. But i shoot faster trees may be dark and i can sharpen the moon. And when i shooy longer tree is sharp and moon is blur . Are there no way to get both sharp?