David Busch's Canon EOS 90D Guide to Digital Photography

Nailing the Optimum Exposure

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Left to its own devices, your 90D can do an excellent job of providing the proper exposure for most scenes. But even a camera as smart as the 90D 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 Canon 90D recognizes backlit situations nicely, and, in most cases, can properly base exposure on the main subject using the default Evaluative 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 ...