I had it set at f/11 and I think I had it open for about 5-8 seconds at a time. Holding the tripod down tightly cuz the wind was blowing like crazy. Then I just push the button over and over. I took about 100 pictures, these 4 were the best. I got about 25 shots that actually had lightning in them.
It is hard though cuz you have to zoom in a bit usually to try to actually get in to take up the sky instead of to be a tiny streak in your big picture. So it's often disappointing cuz a great one will happen just outside your frame. I need at least another camera and some remotes so I can at least get 2 views.