Once the initial bracket is done, make sure you don’t move the camera but review the brackets on your LCD with the histograms visible. The initial choice will depend upon the scene Im shooting and my assessment of the dynamic range but it doesn’t really matter as long as you follow the next step. These days, I typically start with either 5 or 7 images bracketed by 1 stop. To do this, you really have to check your histogram after taking a basic set of bracketed exposures and add to this set if needed. The point of bracketing for HDR is to ensure that you capture the entire dynamic range of the scene as much shadow detail as you can get and all the highlights. An outdoor scene will probably be captured fine using exposures from -2EV to +2EV but inside a cathedral with bright, stained glass windows, for example, it can take 11 shots (or more) spaced 1 stop apart (-5EV to +5EV) to capture the full dynamic range. This may work most of the time but that will likely be by luck rather than design. Some people appear to be under the impression that you can get by with always shooting, for example, 3 images spaced 2 stops apart. This sounds glib but it is, in fact, the truth. Im often asked how many exposures I use for my HDR images and tend to make myself unpopular by answering As many as it takes.
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