Thanks for clarifying the confusion with the f-stop. Really interesting concept I'll have to try. I'm pretty curious 😀.
Absolutely correct that you'd need way more light with ISO100, it was just the note 'low noise and ISO800' that sparked my LOL. Also, I find that newer cameras have a better noise handling even on cropped sensors. I recently changed from a full frame back to a CMOS and find it takes amazingly low noise pictures, even at ISO1600.
Anyhow, thanks for sharing these.