Changing Exposure During Totality

[Kayaker72]

I just played around with some numbers. But a typical bright day is 18 EV. About 3 minutes before totality, I started my video and set it at 1/250th, f/8, ISO 400, or about 12 EV. That was about +1 EV, so the scene was ~11 EV with 180 seconds to go. During totality, my M3 had trouble focusing. I missed a couple of shots. It's lower range is rated at EV 2. So, best guess, totality was ~EV 1-3. So, we went from EV 18 to EV 1-3, or dropped 15-17 stops of light, with 8-10 of those stops coming in 180 seconds. This fits with a chart I just found for different EVs that listed EV 2 as "total eclipse of the moon."

BTW, my G7x II, which I had mounted on a gorillapod, also lost focus. It went blurring during totality.