I am evaluating the RPi camera using raspistill with default settings and for normal daytime light levels the exposure time is adjusted depending on ambient light conditions to give good picture quality. However at dusk and dawn I would expect this to continue but the camera seems unwilling or unable to increase the exposure to greater than 1/8 second. I have tried different exposure modes (-ex ...) but I can't seem to get consistent improvement. I can force longer exposure times using -ss but that is not helpful since I need an automatic solution.
Am I doing something wrong or are there some 'tricks' to work around this?
Would appreciate some advice