detta är en aning "off thread" men jag tyckte att det kan komma med iom att tidigare har det nämnts om films högre dynaamiska omfång. Det finns många som anser att så är inte fallet jag klistrar in en citat av Alain Briot, känd landskaps fotograf:
A - Contrast and dynamic range
The dynamic range represents the amount of contrast a given capture device can record. Film and digital sensors are able to record a fixed range of contrast. This range varies from film to film and sensor-to-sensor, or rather analog to digital converter (A/D converter) since in a digital camera it is the converter that controls dynamic range. Even a 16-bit A/D converter can only capture a dynamic range of 16 stops at the very maximum. However, most Digital Single Lens Reflex cameras as of Fall 2006 use a 10 to 14-bit A/D converter, which translates into a dynamic range of 10 to 14 stops. Even then this dynamic range is limited by noise levels, meaning that shadow areas in the image where detail was captured may exhibit so much digital noise as to be visually unattractive and best rendered as pure black.
Sensors are far better than film when it comes to dynamic range, being able to capture a much wider dynamic range than film, on average. However, this pales in comparison to the human eye which is not only able to see details in a scene containing a contrast range of nearly 24 stops, but also able to instantly change its contrast-perception ability in order to see, alternatively, details in highlights and in shadow areas without the conscious awareness that we are doing so. In other words, the human eye-brain apparatus is not limited to a fixed dynamic range, but instead can adapt to whatever the light situation calls for. If you doubt this statement, or find yourself calculating the exact difference in dynamic range between sensor “x” and the human eye, pause for a second and ask yourself if you ever heard someone say, “I cannot see this landscape because it exceeds the maximum dynamic range that my eyes can capture.” Indeed, you haven’t. You haven’t because humans do not see the world like cameras see it when it comes to contrast.
The fact is that our eyes are far superior to the best films or digital sensors currently available. It is this superiority that, in part, causes us to be disappointed when we see the results of our efforts at capturing what we see with a camera.
Hela artikeln: http://luminous-landscape.com/columns/eye-camera.shtml
ha'de'
Ken
