Good morning, To start, I did a search and read the manual. The search yielded vague responses at best. The manual does a good job of describing the timing, but does not touch on the purpose or use. Regarding slow sync, I understand that the flash fires when the shutter first opens. I can guess from the manual that this would be good for a long exposure with a moving subject in the foreground. For example, you would meter for the night sky and then move your subject (lets say a person) into place. When you fire on the long exposure, the flash would fire and light the person, but the shutter would stay open to capture the appropriate exposure for the night sky. That way, any movement by your foreground subject is not captured. Instead, they are frozen by the flash. Is this correct? Is there any other use for this flash sync setting? I guess I want to know, creatively, what I can do with this setting. Okay, now rear-curtain. This one I don't think I understand as well. I know the flash fires just before the shutter closes. I guess that this could be used for a moving foreground subject and a stationary or unimportant background. When the shutter opens, the camera would capture the movement of the subject and then, right before the close of the shutter, fire the flash to freeze there last point in the frame. This would light the background and freeze the subject at their final location and capture their movement. Again, is this correct? What is the creative potential for this sync setting? How do you use these settings to get nice creative shots with flash work? Thanks!