When the flash is set to slow sync, long exposure times may create unwanted blur in the image. At times like this, you may want to use a camera support. In these circumstances you need to turn the flash off and support the camera for a long exposure. If you don't turn off the flash it will fire and the foreground subjects will appear as if photographed in daylight. If you don't support the camera you will likely have blur from camera movement.
Available light can add beautiful colors to a photograph.
When the flash is off, long exposure times may create blur in the image. At times like this, you may want to use a camera support. When photographing in dim light there are things you can do to get better results when not using flash. Increase the camera's sensitivity. Use the camera's self-timer or remote control.