Great post Joe. Thanks for posting your invaluable experience.
My Nikon D800 has ISO 50 so that may be useful as well. Also it has auto ISO which if coupled with aperture priority mode could work.
If you want to capture those streaming corona then up to 15 radii of the sun would give a calculation for the ideal focal length for that type of shot.
Peter Ward had a nice shot of this from the Libya eclipse. I wonder what focal length lens he used there.
Greg.
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