@Pavel MaÅ¡ek It seems to be a misconception out there...You can't increase DR endlessly - this would be a perpetuum mobile and so...impossible. At the end of the day, output DR is limited by the maximum DR-capabilities of the sensor. By stacking together you can only get more and more near to the DR limits given by the sensor - and get more maleability in post by gathering useful information to work with in highlights, mids and shadows. So, that's a kind of optimizing and NOT increa