Thanks Michael.
They are quite easy actually. The camera is definitely on a tripod, I'm using a cable release and ISO100. I live in a nice dark site and I don't have sky glow to worry too much about so I generally keep the shutter open for 30 - 40 sec, or until I get a strike. Then I shut immediately. When I lived in town I was limited to about 10-15 sec before the glow become noticeable. The lens was a 28-90 zoom and the images were cropped. I'd like to get a nice wide field prime for this sort of shooting as the zoom is too soft.
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