http://www.cs.tut.fi/~hdr/#ref_dloads

The exposure times (seconds) for the whole sequence were [2, 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000], where the shutter speeds shown in bold represent the images used for the composition of the HDR image.