How do i change the shutter speed in a nikon d40?
You turn mode dial on the top of the camera to S for shutter priority then turn the command dial to get the shutter speed you want. Or you can put the mode dial on M for manual and turn the shutter speed to what you want even B for bulb which will keep it open as long as you want then set the aperature by pressing the +/- button and turning the command dial to change the shutter speed. You can also do this on bulb with slow sync flash and get both the writing and the person doing it exposed. If you are looking for a good book on your camera there is the magic lantern series and wiley makes a field guide for it. Another good place to start learning the camera would be the digitudor on nikon-usa http://www.nikonusa.
