Camera
Ready. Shutter, aperture and ISO can be set from here. The app is holding the mode dial, so the camera's own buttons are off.
Off by default. It steps in only when the picture is badly off - a quarter of it clipped, or almost all of it black - and leaves long exposures alone. Each kind of shot keeps the setting that matters to it. A change you make yourself is left alone.
One press takes one picture.
One press, and it stops itself. The drive mode is set to a burst if it is not already. Hold to shoot keeps going while the button is held down; Start a burst does the same without holding anything, and stops on the next press. Both stop on their own if this page goes quiet.
Flats need an even twilight sky, bias a dark sky, darks the lens covered. Take pictures first for darks to match.
Version v0.0.0.1.58