I've been experimenting a bit with some long exposure shots on a Canon SX530 HS, and have noticed that it takes twice as long as the exposure time to actually shoot anything (2 seconds taking, 2 seconds "busy"). I'm led to believe that this is taking a 'dark frame' for some kind of long-exposure noise reduction - however I wanted to try photographing a fireworks display, and so would really like to not have that dead time in between shots, so I'd like to disable this feature. When I look through the settings, though, I can't find anything relevant.
Is there any way I can turn this noise reduction feature off on this model of camera, or am I stuck with it?