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Thanks Geoff. I've asked Fred for a higher time resolution version of his curve for comparison. Just eyeballing it though, it looks similar to Joe's.
I've gone back and forth on the bracketing question during totality. Leaning towards no atm, based on your images and using a 1/4s,iso 100,f/4 exposure. At iso 100 RAW (5D2), I should be able to pull 2 stops (or more) out of the shadows, which gets me to your recommended 1 sec for landscape. My concern is the highlights + horizon. Any chance I'll get blowouts along the horizon (where the sun still shines?). Should I pull back to f/5.6 to be safe, and live with darker shadows?
If I can avoid bracketing or complicated multi-cam hdr setups, I reckon 20 sec (24fps) of smooth(*ish) footage is feasible via bulb ramping. Assuming the light drops 3 stops in the last 3 minutes and totality is captured at 1/4 s shutter, 1fps.
1. Ingress Partial phase 3 mins -> C2. 1/30 -> 1/4 sec (bulb ramp). 180 frames
2. Totality. 1/4 sec (constant shutter). 120 frames
3. Egress Partial phase C3 -> 3 mins. 1/4 -> 1/30 sec (bulb ramp). 180 frames
* It's likely the bulb ramp will suffer some flicker near the start and end. Need to test this in the next day or so.
I'll run the full test soon and report back.
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