Shooting lightning is, for me at least, challenging and at times a bit scary. Here are a few captures from a big lightning storm in Colorado USA in 2009. It was a fast-moving storm, SE corner of Rocky Mountain National Park at about 9:30 PM or so. I used a Canon 1D MKII, 24-70 L zoom at approximately 35 mm, ISO 100, BULB mode, manual release timed to capture multiple flashes (beyond 30 sec noise is harsh and overexposure is an issue), in-camera noise reduction on, tripod:
This next strike scared the heck out of me (
!) and I backed off for a while until there was more distance between me and the big ground strikes like this one.
Shooting these in RAW file format is important because white balance must be corrected due to the long exposures. The usual approach of framing the picture, fiddling with various settings etc. isn't practical. I pre-set the aperture between F8 and F11 and focus at infinity. Sure I got a bit wet, as did the camera/lens/tripod - but I don't worry about weather much because the 1 series Canon bodies and the L series lenses have excellent weather seals throughout.
In this case I was lucky to get some very powerful near-by ground strikes in rapid succession. One trick I've discovered is to release the shutter (terminate the exposure) the very instant a big strike occurs. The fine branching away from the main bolt is better preserved and the inevitable over-exposure is minimized. Regarding post-processing, little is required beyond cropping, white balance and additional noise reduction on occasion. The last thing I do to these in post-processing is use my sharpen brush at 2-4% in the 'lighten' mode applied to the lightning itself. For lighting strikes that aren't strong enough for my taste, I will sometimes use the high pass filter to sharpen the lightning detail. I use PSCS5 for post-processing.
Above all, never assume you're safe anywhere near lightning! Learn the best precautions to take, and apply them.