Camera Basics
Metering Modes Explained for Beginners
Learn how camera metering modes work and when to use spot, evaluative, center-weighted, or partial metering to get the right exposure every time.
Your camera has a built-in light meter that measures the brightness of a scene before you take a shot. Metering modes tell it where to look. Pick the right mode and your photos come out properly exposed. Pick the wrong one and the sky blows out, a dark face goes muddy, or the whole frame just looks wrong.
This guide walks you through the four common modes, explains what each one actually does, and helps you decide which to reach for in different situations.
How Camera Metering Works
The light meter inside your camera does one job: it samples the light in the frame and calculates an exposure that would make the scene look "average." In practice, cameras target what's called 18% grey, a mid-tone that sits roughly halfway between pure black and pure white.
That works beautifully for balanced scenes. It breaks down when the frame is dominated by something very bright (snow, a white wall, a backlit window) or very dark (a stage, black fabric, a night street). The meter tries to drag that brightness toward middle grey, which means white snow can come out grey and a dimly lit subject on a dark background can come out overexposed.
Understanding this target is the key to understanding all four modes. Metering modes change which pixels the camera samples. They do not change the 18% grey target.
Note: manufacturers use different names for these modes. Canon calls its all-purpose mode Evaluative; Nikon calls theirs Matrix; Sony uses Multi. The behaviour is nearly identical. Check your manual for the exact term your camera uses.
The Four Main Metering Modes
Evaluative / Matrix Metering
This is the default on most cameras and the one you are likely already using.
The camera divides the frame into a grid of zones, measures the brightness in each zone, compares the pattern against a database of thousands of reference scenes, and then picks an exposure. Modern evaluative metering also considers where the camera's autofocus point is, giving slightly more weight to whatever the camera thinks you are focusing on.
It handles the widest range of situations well. For outdoor portraits in open shade, landscapes with an even sky, and most daylight street scenes, evaluative metering makes a sensible decision without any input from you.
Its weakness shows up in high-contrast situations: a person standing in front of a bright window, a singer under a spotlight, a white lighthouse against a deep blue sky. The meter tries to average things out and often gets it wrong.
Center-Weighted Metering
The camera measures brightness across the whole frame but assigns more importance to a large circle in the centre, roughly the middle third of the image.
It ignores the details in the database that evaluative metering consults. The trade-off is that it is more predictable and less likely to produce surprising results. Many film photographers learned on center-weighted meters and still trust it for portraits, where the face typically sits near the middle of the frame.
If your subject is centred and the background is not dramatically brighter or darker than they are, center-weighted is a solid, consistent choice.
Spot Metering
Spot metering reads a very small circle, typically 1 to 4 percent of the frame, centred on your active focus point (or on the centre of the frame, depending on your camera model). Everything outside that circle is ignored entirely.
This sounds restrictive, but it is exactly what you want in specific situations:
- A bird against a bright sky: meter off the bird's feathers and the sky will blow out, but your subject will be correctly exposed.
- A performer under a single spotlight: meter off their face rather than the dark stage.
- Backlit portraits outdoors: meter off the cheek or forehead rather than the bright sky behind.
Spot metering requires you to think carefully about what you are metering. Move the spot to a shadow and everything gets overexposed. Move it to a highlight and everything gets underexposed. Practice reading a patch of mid-tone skin or fabric before you commit to a shot.
Partial Metering
Partial metering is primarily a Canon feature. It works like spot metering but samples a larger area, around 10 to 15 percent of the frame. It is less precise than spot but more forgiving. Sony and Nikon cameras generally do not include a separate partial mode; their spot modes are the equivalent.
If you are shooting in a Canon menu and find spot metering too twitchy, partial metering is worth trying for backlit subjects.
Quick Comparison: Which Mode Measures What
| Mode | Area Sampled | Best For | Watch Out For |
|---|---|---|---|
| Evaluative / Matrix | Entire frame (zone-weighted) | Balanced daylight scenes, travel, casual shooting | High-contrast scenes with bright backgrounds |
| Center-Weighted | Whole frame, biased toward centre | Centred portraits, predictable results | Off-centre subjects, very bright or dark backgrounds |
| Spot | 1–4% around focus point | Backlit subjects, spotlit performers, high contrast | Easy to meter off the wrong tone accidentally |
| Partial (Canon) | 10–15% around centre | Backlit subjects when spot feels too small | Less precise than spot for small subjects |
When Spot Beats Evaluative: Two Real Examples
Example 1: Backlit portrait. You are photographing a friend sitting near a window on an overcast day. The window behind them is about three times brighter than their face. Evaluative metering averages the room and the window together, concludes the scene is bright, and sets an exposure that leaves the face dark. Switch to spot metering, place the focus point on your friend's cheek, and the camera exposes for the skin tone correctly. The window will be blown out, but the person looks right.
Example 2: Moon in a dark sky. Point your camera at a full moon against a black sky. Evaluative metering sees mostly black and opens the exposure until the moon becomes a white blob with no detail. Spot meter directly on the moon's surface and the camera reads the actual brightness of that disc, keeping its craters and texture visible.
These are the situations worth switching modes for. Evaluative handles everything else competently.
Putting It Into Practice
The most useful thing you can do right now is try all four modes on the same high-contrast scene and compare the results. A backlit window with someone standing in front of it works well, as does any scene with a large bright area next to a shadowed subject.
Notice how the histogram shifts between modes. The exposure triangle determines the overall amount of light; metering tells the camera which part of the frame to base that calculation on. Once metering gives you a baseline, you can also adjust exposure compensation to nudge things brighter or darker without switching modes.
Understanding metering works closely with two other fundamentals. Aperture controls depth of field and affects how much light the sensor receives. Shutter speed determines whether motion is frozen or blurred. Together, all three settings respond to what your meter tells the camera.
Start with evaluative metering for most shooting and switch to spot when you have a subject that is significantly brighter or darker than the background behind it. That single habit covers the majority of situations where metering trips beginners up.
Frequently Asked Questions
What metering mode should a beginner use?
Start with evaluative or matrix metering. It handles most outdoor and indoor scenes well and does not require you to think about where to point the meter. Once you run into situations where the exposure looks wrong despite correct settings, that is the right time to experiment with spot metering.
Why does my camera overexpose snow or a white background?
The meter sees a very bright scene and assumes it should be middle grey, so it underexposes to pull it down. With snow, that means the snow goes grey. You can fix this by dialling in positive exposure compensation (typically +1 to +2 stops for bright snow) or by switching to spot metering and reading off a mid-tone in the frame rather than the white area.
Does metering mode affect RAW files?
Metering mode influences the exposure the camera chooses, which affects the RAW file. However, RAW files retain more tonal information than JPEGs, so you have more room to recover highlights and shadows in editing. That said, it is easier to get the exposure right in camera than to rescue a badly metered shot in post, especially if highlights are blown completely.
Can I lock the exposure after metering?
Yes. Most cameras have an AE Lock button (often labeled AEL or marked with an asterisk). Point the camera at the tone you want to meter, press AE Lock, reframe your shot, and take the photo. The exposure stays locked on what you metered, even if the metering point is no longer in the frame. This is useful with spot and partial metering when your subject is off-centre.
Do all cameras have the same metering modes?
The core modes (evaluative/matrix, center-weighted, spot) appear on most interchangeable-lens cameras. The names and the exact area covered by spot metering vary by brand and model. Entry-level cameras may not include partial metering. Check your camera's manual for the exact modes available and where to find them in the menu or on a dedicated button.