AW: Canon 400D firmware hack zum setzen erweiterter ISO Modi
jain. die 40d macht "echte" ISO1600, die ISO3200 sind aber gepusht (also das gleiche, wie wenn man mit ISO1600 eine blende unterbelichtet und in der nachbearbeitung). erkennt man daran, dass die ISO3200 nur durch die erweiterung erreichbar sind. dazu schreibt bob atkins in einem review der 50d:
"The reason why Canon (and other camera makers) offer a "standard" and "expanded" ISO range is twofold. First the "normal" range should give good results and low noise, whereas the "expanded settings" may be lower quality. However there is a more technical explanation. In the "normal" or "native" settings, ISO is determined by the gain of the analog amplifiers between the sensor output and the analog-to-digital converters. In the expanded range settings, the effective ISO is obtained by a digital technique which could be considered equivalent to "pushing" film. For example if ISO 1600 is the highest normal settings, then an ISO 3200 "expanded" setting might be obtained by under-exposing the sensor by one stop at ISO 1600 and then digitally processing the resulting image to increase the brightness up to a level that you'd expect from ISO 3200."
gruß luisoft
jain. die 40d macht "echte" ISO1600, die ISO3200 sind aber gepusht (also das gleiche, wie wenn man mit ISO1600 eine blende unterbelichtet und in der nachbearbeitung). erkennt man daran, dass die ISO3200 nur durch die erweiterung erreichbar sind. dazu schreibt bob atkins in einem review der 50d:
"The reason why Canon (and other camera makers) offer a "standard" and "expanded" ISO range is twofold. First the "normal" range should give good results and low noise, whereas the "expanded settings" may be lower quality. However there is a more technical explanation. In the "normal" or "native" settings, ISO is determined by the gain of the analog amplifiers between the sensor output and the analog-to-digital converters. In the expanded range settings, the effective ISO is obtained by a digital technique which could be considered equivalent to "pushing" film. For example if ISO 1600 is the highest normal settings, then an ISO 3200 "expanded" setting might be obtained by under-exposing the sensor by one stop at ISO 1600 and then digitally processing the resulting image to increase the brightness up to a level that you'd expect from ISO 3200."
gruß luisoft
