Bracketing, an option available on most SLRs involving the execution of a series of shots of the same scene at a fixed aperture and the changing times, with the specified increments. This stroke and the number of shots depends on the type of camera, for example, in Canon EOS 5D is 3 frames with a maximum 2 EV increments, the Nikon D200 to 9 shots with maximum increments of 1 EV. This feature originally had another use but has proved very helpful in the performance of individual radiation needed to complete the picture in the HDR.