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For me the pure black disk of the Moon was expected, but not that thin shining circle (and did the rest of you have that impression of that circle or was it just me?)
You mean shining circle as in a solid ring and no details visible near the disk? I also noticed that as different from the 2015 eclipse, and this is what I meant by describing the corona as somewhat "washed out". I thought that it could be caused by the smoke layer above Madras, but it could be a feature of the corona on that particular day as well.
The extent of the corona took me by surprise in the 2015 eclipse as well. Hard to tell which had the largest corona. The 2017 corona wasn't strikingly large to me, but it doesn't mean that the 2015 corona was larger. This time I knew what to expect. In 1999 the corona was barely visible for a few seconds at my location during totality.
A lot of beautiful HDR images have been published after the eclipse, but I have yet to see an HDR video
of the third contact (or second, but that's more tricky). It shouldn't be too hard to make with the right gear. With multiple cameras, that is. It could be really near to see the Baily's beads and the diamond ring as an HDR video. For this I think it'll be better to do it closer to the edge of the totality zone than the centre line, since the beads and diamond will be visible for a longer time near the edge.