Hi, this is basically a 3 frame panorama in vertical orientation. Each frame is 5 exposures from -5EV to +3EV with 2EV increments constantly. Each frame of 5 exposures are blended digitally by HDR then these three frames are stitched in CS6. Btw i had to restitch a few times as there was a block which didnt stitch well, presumably due to being at the edge of the frames. Hope that helps!
Hi nitewalk, thanks for sharing and will try it out.
Cheer!