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Hi Colin,
Nice to hear from you.
Was it all due to low cloud in 2013? Near the south limit, we had clear horizon yet the horizon was still dark 2 mins before sunrise because the Sun was ~ 89% eclipsed. Like you, I couldn't see my surveyed horizon markers to prepoint the camera for sunrise. Fortunately for me, the under exposure warning started flashing bright yellow. In that yellow was the outline of my funny shaped tree that marked my horizon point. So I didn't need to up the ISO.
FWIW I never picked the ISO25000 section in your video.
Video :
Unlike Ruben's video, in between the Teton's being hazed out and being in silhouette, the side facing us were very briefly sunlit. Ruben's video does not show that.
Cheers
Joe
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