In article , Carlos E.R.
wrote:


Double exposure in film, I can understand.

yep. there are far fewer options with film.

But a digital camera would just add the pixel values from two files,
thus being no different from postprocessing on the computer.

it's different in that it doesn't require a computer.

To be valid, the sensor would have to be exposed, and then, without
reading it, exposing it again. Are they really doing it?

that's not required, nor would it work particularly well.