Wyk sounds like someone who really know what he/she is doing with the manual mode.
Maybe my question is put wrongly, since i was told to use auto mode, when i really want to use manual.
let me rephrase my question, hoping I can get an answer.
Does the Camera App have a feature similar to a light meter build in, so that I can estimate how much light will flow trough the lens with different shutter speed control real time before I press the shutter? With the information I can also estimate which ISO and should there be a need to adjust the over expose or under expose level.