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[quote name='Bjørn Tore' timestamp='1298925328' post='6404']

Hi



My lens and camera combination is Canon 85mm f/1.8 and 5D markII.



I don't want to use tripod or flash indoors.



I have heard that there is possible to change the exposure by 2 steps if you shoot in raw.



I don't think I want to use higher ISO or shorter shutterspeed as they are pushed to its limits.



Then I think that I can underexposure every picture I take indoors and change the exposure back with imagining software, but I guess that I will loose some image quality. Could this be a better option than using very high ISO settings?



Regards

-Bjørn

[/quote]

Both are basically the same!



Sensors do NOT change sensitivity with changing ISO settings. The camera just applies more amplification of the received light.

When you underexpose and then amplify the exposure on the computer, you are doing on the computer what the camera's electronics otherwise would have done.



As such, it will not make a big difference, whether you let the camera do the amplification, or your computer.