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Well, I went back into Adobe Bridge and selected all frames and took them into raw, selected all frames again and set them all to default (as shot).
Same issues in all the same places. I'm starting to think that maybe it's the timer I used. Magic lantern is widely used, but it is open source. Perhaps there's a bug where the shutter was open for longer than the 10 second exposure, but it was still reporting the metadata as 10 seconds.
I did another series, same night, different lens (50mm Sigma Art), which worked fine. Which is useful for this series from the point of view of troubleshooting.
Thinking about it, I was exposing for 10 seconds with a 5 second cool down between frames. Maybe Magic Lantern started exposing for the full 15 second cycle, which would cause a brightness jump of the kind of magnitude I'm looking at here.
Also, I swapped out the CF card right before this series. Each card has a little copy of the operating system on it. Maybe the OS on that particular card has been a little bit corrupted.
So variables I will test are;
Refresh OS on card / use a different card
Use different (external) interval timer
See if it only occurs with the 24mm lens
I'll let you know how I go :-)
Thanks
Markus
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