Varying exposure values from f4.0 to f 7.1 My camera has a auto bracketing feature which can be pre-selected meaning that one press of the shutter takes an image at the correct exposure and then one step about and one step below. The steps can be set at 1, 1/3, or 2/3rds of a stop. I have used this feature to stitch together three images to produce an HDR image using photomatrix software.
Pictures taken at iso of 200 / 400 / 800 showing different amount of grain 200 (Less) 800 (more). Generally higher values give less clarity and auto iso on my D7000 can be selected to limit at a higher value such as iso 800. However reading the web suggests that the camera can give clear pictures up to 1600 in ideal conditions. It lectures it has been suggested to me that the D7000 as a Nikon has a 'sweat spot' at iso 200 meaning that this is the clearest image although generally the lowest iso of 100 is thought to give greater clarity