Nailing the Optimum Exposure
Left to its own devices, your a6400 can do an excellent job of providing the proper exposure for most scenes. But even a camera as smart as the a6400 frequently can benefit from intelligent input. For example, when you shoot with the main light source behind the subject, you end up with backlighting, which can result in an overexposed background and/or an underexposed subject. The Sony a6400 recognizes backlit situations nicely, and, in most cases, can properly base exposure on the main subject using the default Multi metering mode, producing a decent photo.
But, as a creative photographer, there will be many instances where you would rather not have automatic correction for backlighting. What if you want to underexpose ...