Exploring the information in slight more details it can be stated that auto exposure cameras are
provided with a fixed focus lens or manual focus lens. These cameras are the simplest to set
exposure. To obtain the correct exposure for a particular subject of photography, the only thing
that needs to be done is to simply lock the exposure by pressing the shutter down halfway on the
digital cameras upon a reference object that is about one fifth gray and also illuminated by the aid
of the same source of light as subject of photography. After locking the exposure, the
photographer has to recompose the frame and shoot the picture. Auto exposure and auto focus
cameras are to some degree harder for setting the exposure, because they contain the exposure
lock that is generally tied to focus-lock. However, the users or photographers using these auto
exposure and auto focus cameras can still make adjustments for the correct exposure and correct
focus using the digital cameras and make the photographs perfect! Again, the exposure can be
adjusted by locking on an 18% reference that is illuminated by the aid of the same source of light
as subject of photography. The users have to only ensure that the distance to this so-called
reference is the same as the distance to the subject of photography that actually sets the focus.