Metering Modes Explained: Matrix, Center, and Spot

Your camera's light meter measures brightness and suggests an exposure. Metering modes control where it looks. Pick the wrong area to measure and a perfectly capable camera will underexpose a face or blow out a sky. The meter feeds every mode in the exposure triangle, so this setting matters whether you shoot manual or a priority mode.

The three metering modes

Matrix / evaluative metering

The camera splits the frame into zones, reads them all, and balances for an average that usually looks right. This is the default and the right choice for evenly lit scenes: landscapes, group shots, most daylight photography. Nikon calls it matrix, Canon calls it evaluative, Sony calls it multi.

Center-weighted metering

The camera reads the whole frame but gives the center far more importance. Useful when your subject is roughly central and you do not want a bright edge or corner to throw off the reading. A classic case is a portrait against a busy background.

Spot metering

The camera reads only a small circle, often a few percent of the frame, usually at the center or the active focus point. This is the precision tool. Use it when one part of the scene is the part that must be exposed correctly and the rest can fall where it lands.

Partial metering

Canon adds a fourth mode, partial, that sits between center-weighted and spot. In Canon's EOS M50 Mark II manual, the metering mode page puts partial metering at about 5.8% of the center of the screen and spot at about 2.9%, recommends partial when much brighter light surrounds the subject, such as backlighting, and says evaluative metering is normally recommended. Partial is a little more forgiving than spot because a slightly misplaced reading still averages a larger patch of the subject.

When to use spot metering

Spot is the mode beginners skip and then wish they had known about. Reach for it when the subject and the background are very different brightnesses:

• A backlit face: spot meter on the cheek and the face exposes correctly, even if the bright sky behind goes lighter.
• A spotlit performer on a dark stage: spot meter on the performer and ignore the black surroundings.
• The moon: a tiny bright object in a huge dark frame fools every other mode.

Spot metering pairs naturally with exposure compensation when the thing you metered is not a neutral mid-tone.

Metering and exposure lock

Metering mode also changes when the camera locks exposure. Canon's EOS R50 manual for metering modes notes that with evaluative metering and One-Shot AF, a half-press locks the exposure once the camera focuses, while partial, spot, and center-weighted set the exposure at the moment the picture is taken. The R50's AE lock page explains the manual alternative: meter, press the AE lock button, then recompose. With evaluative metering the locked exposure centers on the AF point; with partial, spot, or center-weighted it centers on the middle of the frame.

That matters when you meter and recompose. If you spot meter a face in the center and then move it to the edge of the frame without locking, the camera meters whatever is now in the center.

Three worked examples

Portrait in front of a bright window. Evaluative metering gives f/2.8 · 1/500 · ISO 200, and the face is two stops too dark because the window dominates the reading. Switch to spot, meter the cheek, and the camera chooses f/2.8 · 1/125 · ISO 200. The face is right and the window goes white, which is usually the correct trade. See backlight and silhouettes.

A singer under a spotlight. Evaluative or center-weighted metering sees mostly black stage and brightens everything, blowing out the singer's face. Spot meter on the face, then add -1/3 to -2/3 EV of exposure compensation if skin still looks hot. A typical result is f/2.8 · 1/250 · ISO 3200.

A snowfield in sun. Every mode sees mostly white and pulls it toward gray. Stay in evaluative and add +1 to +1.7 EV, then confirm the snow sits near the right edge of the histogram without clipping.

How metering connects to the rest

Whatever the meter reads, it still moves the same three controls. In aperture priority it changes the shutter speed; in shutter priority it changes the aperture; in manual it just shows you where 0 sits. To verify the actual result rather than the meter's guess, check the histogram.

A useful daylight reference exposure to sanity-check the meter against is f/8 · 1/250 · ISO 200.

Common mistakes

• Leaving spot metering on by accident. Then every wide landscape exposes for one random point. Return to matrix when you are done with the tricky shot.

• Spot metering on the wrong tone. The meter assumes whatever you point it at is mid-gray. Spot a white wedding dress and the camera darkens it to gray. Add positive exposure compensation, or meter a mid-tone instead.

• Blaming the camera for backlight. A dark subject against a bright window is a metering choice, not a camera fault. Switch to spot or center-weighted.

• Forgetting the focus point link. On many cameras spot metering follows the active focus point. Move the point and you move the meter.

• Recomposing without locking. In spot, partial, and center-weighted modes, some cameras do not lock exposure on a half-press. Use the AE lock button before you move the frame.

Where to go next

Use the exposure calculator to see what a two-stop correction from spot metering does to your shutter speed and ISO before you are on location. Then read how to read a histogram, which is how you confirm the meter got it right, and exposure compensation explained, which is how you correct it when it did not.

What metering mode should I leave my camera on?

Matrix or evaluative metering for everyday shooting. It handles the majority of evenly lit scenes well. Switch to spot only when the subject and background brightness differ sharply.

Why does my backlit subject come out as a silhouette?

Matrix metering averaged the bright background into the exposure, so the camera darkened everything and your subject fell into shadow. Spot meter on the subject, or add positive exposure compensation, to bring the face back.

Does metering mode matter in manual mode?

Yes. In manual mode the metering mode changes what the meter scale reads, so it changes where 0 falls. You still decide the final exposure, but the reference you are aiming at depends on which area the camera is measuring.

What is the difference between spot and partial metering?

Both read a small area instead of the whole frame. Spot reads the smaller area, about 2.9% of the frame on the Canon example above, for pinpoint readings. Partial reads a larger patch, about 5.8% on the same camera, which is more forgiving when the subject is small but not tiny. Partial is mostly a Canon term; other brands offer spot and center-weighted options instead.