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I tried a lot of manual exposure times from 5sec to 15sec using ISO 100, 200, 400. By the end I was using exposures of Iso200 or between 6 to 10 sec. There was a LOT of blanket lightening and I found these settings gave me good illumination of the clouds but still giving good contrast. If there was a definate bolt of lightening I would release the bulb immediately it was over.
I was only mounted on a very light tripod so I used the mirror lock hack at the same time.
btw the first shot is a crop and enlargement from waaaay in the distance and the focus wasn't quite right which is why it isn't nice and crisp. That was one of the other challenges, trying to focus. I ended up putting the camera in autofocus mode, focusing on the furtherest brightest light I could see and then switching to manual focus
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