What is the advantage of bracketing by changing shutter speed or aperture?
Bracketing is used when you are unsure about the correct exposure. The camera will take one photo of the exposure it thinks is correct, one a bit darker and one a bit lighter – its then up to you later which one looks best and has most detail. Choose to bracket by changing the shutter speed if you have chosen an aperture for the depth of field it gives you. Choose to bracket by changing the aperture if you have choosen a shutter speed to control movement or limit camera shake.
You bracket by changing shutter speed and it’s done when the lighting is tricky or you want to capture a high dynamic range of tones (HDR). You change shutter speed to preserve the depth of field so it is the same in all pictures. Reasons for changing shutter speed such as for freezing or allowing blur in the pictures, doesn’t apply as the any moving objects will move between frames anyway.
