Center-weighted metering is an exposure metering mode that averages brightness across the entire frame but biases the calculation heavily toward the center, typically the central 60 to 80 percent of the image area. It was the dominant metering mode in 35mm SLRs from the 1960s through the mid-1980s, when Nikon’s matrix metering and Canon’s evaluative metering displaced it as the default. It remains an option on every modern camera and is still useful in specific situations where the photographer wants predictable, weighted-average behavior rather than computational scene analysis.
The mode is most useful for portraits where the subject sits centrally in the frame and the photographer does not want bright edges, like a sky or a window, to fool the meter into underexposing the face. It is also reliable for stage performances and concerts, where a spotlit subject against a black background would cause matrix metering to overexpose by trying to average the dark background into middle grey. Center-weighted ignores most of that background and exposes for what is in the middle of the frame, which is usually what the photographer wants.
The exact weighting curve varies by manufacturer. Canon historically uses a 75/25 split, with 75 percent of the calculation drawn from a roughly 8mm circle in the center of the frame and 25 percent from the rest. Nikon offers a configurable center weighting in some models, letting the user choose from 6mm, 8mm, 10mm, or 13mm circles, with the rest of the frame contributing the remaining percentage. The behavior is predictable in a way matrix metering is not: the same scene composed the same way produces the same exposure every time, which is important for reproducibility in catalog or product work.
The historical reason for the mode’s dominance was that early SLRs used a single silicon photodiode reading the full focusing screen with a weighted-mask filter optimizing for typical subject placement. The 60/40 split favoring the center was a hardware compromise based on studies of where amateur photographers placed their subjects. As multi-segment metering arrived (Nikon’s 1983 FA was the first with 5-segment matrix metering), the algorithmic approach proved more reliable across varied scenes, and center-weighted retreated to specialist use.
Compared to spot metering (which samples typically 1 to 5 percent of the frame at a chosen point), center-weighted gives a more forgiving average that does not require precise placement of the metering point. Compared to matrix metering, it removes the camera’s scene-recognition logic from the loop, which is what an experienced photographer wants when they know the scene better than the camera does. The mode pairs well with exposure compensation, since the user can predict reliably how to bias the exposure based on the subject’s tonality (compensate +1 for white subjects, -1 for black, similar to using a handheld incident meter).
For most modern photographers, matrix or evaluative metering is the right default. Center-weighted comes back when the scene is high-contrast and predictable: a single backlit subject, a stage spotlight, a person against a window. Switching to center-weighted in those situations is faster than dialing in exposure compensation or using spot metering with manual exposure lock.