Thanks for the thread, you helped me remember something. I was typing between patients at work and am now at home with my camera. I forgot- but my camera has a 7 point autobracket spread which adjust exposure times. It would be interesting to see if it had an ISO adjustment option instead of the Tv.
***I just toy around with this stuff, so others may have much more experience, but if I was serious about getting a good shot (and I'm not- I'm not going to be under it), I would consider getting out the equipment here in the next couple of days and doing some night moon photography/ sunrise/ sunset. etc just to get used to the settings and how the telescope lense handles/tracking. I was at the beach last week trying to get some night time shots of a distance storm over the ocean, and I noticed I had gotten a little rusty. By the time I had the settings dialed- the best of the distant lightning was gone. FWIW- I'd also probably shoot in RAW, or RAW+JPEG. I usually shoot jpeg because RAW is kind of a PIA, but it does seem to be a little more controllable in post editing in my amateur hands.
***obviously going through these geeky motions would ensure clouds on the day of the eclipse.
Have fun!