I don't know if this is technically possible (in terms of software), but the ideal solution for HDR photos would be to take all 3 photos in "1 pass".

What would need to be done for this is create a software (which I don't know if it viable) that "opens the shutter" for the maximum period of time of the highest exposure photo of the sequence, but that takes the "snapshots" of the lower exposure shots at the same pass.

Let's suppose we are taking 3 photos (theoretical times):
- 1/12s
- 1/6s
- 1/3s

We would have the following timeline:
0s: open shutter (light goes in the sensor, software starts "capturing process")
- 1/12s: take first snapshot (JPG image with 1/12s exposure. Shutter remains open)
- 1/6s: take second snapshot (JPG). Shutter remains open.
- 1/3s: last snapshot of the sequence. Save the third image and finish process.

I believe this is the best case for any HDR photo, but I wonder if the software/hardware combination is able to do this. Software can be limited to how you can use the camera driver, and hardware can limit us on how fast can you take the "snapshot" and save it while having to save the second and third snapshots in very near time.

Hope I made myself understood .

What do you think?