interesting shot ! I suspect there are a good amount of people who "Lurk" here ,that would love to know YOUR method for capturing lightning . even though folks don't comment ,they still search for information .
I took the photo with my I-phone. I used the time lapse option then went into the shot and picked the photo I wanted and screen shot the picture. Our house site allows long views over the valley. This allows for some great rainbows and storm views.