Spot Metering for Available Light Portraits: RF 50mm f/1.8 STM
Evaluative metering is correct most of the time. It analyzes the scene, weights the meter reading toward the focus point, and produces an exposure that protects the most information across the widest area of the frame. In scenes with even illumination and a subject that occupies a significant portion of the frame, it works without adjustment. In scenes where the subject is lit differently from the background — a face in open shade against a bright street, a person near a window with an unlit room behind them — evaluative metering averages toward a wrong answer.
Spot metering on the R-series links to the active AF point when Center-Weighted Spot to AF Point is enabled. Point the active focus point at your subject’s face, lock the metering (AE Lock via the * button), recompose if necessary, fire. The exposure is calculated from the face. Everything else is allowed to go where it goes.
The RF 50mm f/1.8 STM is the lens for this exercise because it is available to almost anyone shooting Canon RF. At f/2 in a mixed-light indoor environment, the combination with spot metering produces clean facial exposure even when the background is two to three stops brighter or darker. The face is the exposure target; the background describes the environment without competing.
The practical result is that backlit portraits stop looking underexposed and overlit portraits stop losing highlight detail in skin. Evaluative metering was trying to save both; spot metering decides which one matters and commits.
The technique is faster than it sounds in description. AE lock, recompose, fire — three actions that become one reflex after a week of deliberate practice. The discipline is remembering to do it rather than defaulting to the camera’s judgment in high-contrast situations.
Spot metering is the camera trusting your judgment instead of its own. Use it in exactly the situations where the camera’s judgment is visibly wrong.