Default Android manual camera

HI all, is there a camera app with really full manual controls?
I tryed Camera fv-5, it's quite good but if i try a long exposure it looks something "fake", because long exposure doesn't make the picture become lighter, it looks more something like a series of pictures overlapped.
I'd like to know if there is something that allows to make a real long exposure, to take picture to the sky or other night scenes.
Thank you