It was not until my third storm chasing tour where I bought a tripod in order to be able to take some lightning shots. I bought it at WalMart for about $15 and it was among the cheapest ones but it did the trick. Using the BULB feature on my Canon I was able to take these lightning shots. The most difficult thing was to catch the lightnings in the frame, many of these photos were cropped to a fraction of the original size since the lightning appeared in a corner almost every time.
Outside of cropping and resizing, these images have not been improved in Photoshop.