OK im must sound really dense but so far all my pics have been taken on the preset modes of my Nikon D50. I now want to learn how to work the camera settings together on manual. i understand what Aperture is, and how it works with the shutter spees to obtain the right exposure and DOF. So my question is this... How on earth do i determain the settings?????? how I do i know what F stop to use and how fast/slow my shutter speed should be?? and how to i use metering??? Sorry to sound thick!