Here’s my theory: I searched for some videos of 99% and 99.5% 99.9% totality. It turns out if you are in 99.5% totality you basically do get to see quite a show albeit a short one. You will see the black disc of the moon and the diamond ring. It’s just that the diamond ring is maximum eclipse and is basically still illuminating your location albeit very dimly. This is why there is no clearly defined umbral boundary. My guess is why there are so few videos of this: anyone that close who takes the time to video will obviously move a few miles to capture full totality.
Sure, it gets to an extremely small crescent or a really bright and big diamond ring (same thing). And the ambient LUX gets very low. But you never get to full totality with full corona.
Here’s my theory: I searched for some videos of 99% and 99.5% 99.9% totality. It turns out if you are in 99.5% totality you basically do get to see quite a show albeit a short one. You will see the black disc of the moon and the diamond ring. It’s just that the diamond ring is maximum eclipse and is basically still illuminating your location albeit very dimly. This is why there is no clearly defined umbral boundary. My guess is why there are so few videos of this: anyone that close who takes the time to video will obviously move a few miles to capture full totality.
Sure, it gets to an extremely small crescent or a really bright and big diamond ring (same thing). And the ambient LUX gets very low. But you never get to full totality with full corona.