May I enquire as to your method for creating the HDR. Did you use Photomatix, PS or other? I have figure out how to do in in photoshop except I sturggle with the tonal mapping stage at the end when converting it back to 16bit. Photoshop gives you four options for this of which the only uselful one is the 'Local Adaption' option but I don't know how to change the curves to give a good final result. Can you give me any advice on this?