OK, so I didn't do much to prepare for this, other than getting my welding goggles and 500mm mirror lens.
We only got a partial eclipse - about 74%, I think.
The clouds moved in just at the right time, allowing me to pop off a few shots. The clouds acted as a 100X ND filter, I think. Even with a 74% eclipse, I was still only getting a bright blob in the clear sky.
I probably did need to pick up a solar filter. Maybe for the next one in seven years.
And a short video that shows how it got much sharper when the clouds moved in.
Technical info: Sony A7II with 500mm catadioptric lens set at f/16. ISO was set at 50 with exposure compensation dialed down to -3EV. I shot RAW and converted in Corel AfterShot2 - a pretty decent program, I have to say. Shutter speeds ran from 1/1,600 to 1/8,000.
Just looked, and the first one was shot at ISO 320 with no exposure compensation.