I have a Nikon D5100 and the auto focus works fairly well most of the time. But there are times when I have a subject in focus and want to fire off multiple shots fairly quickly. I do not need to focus every time on the subject yet auto focus will attempt to re-focus the picture every time that I press the shutter down. Only way I have found around this is to switch to manual focus. Is there a way to keep the camera in auto focus mode but have it not auto focus every shot.
An example: I was shooting the moon (no pun intended => ) the other night and the auto focus had the moon in focus without an issue. Every time I pressed the shutter the camera would attempt to focus. I was attempting to fire the shutter as quick as possible to show to motion of the moon rising and having it focus every time causes too much delay.