Try It Yourself: Camera Simulator
See it side by side
Metering on the subject in a backlit scene exposes the face or form correctly and lets the background blow out. Letting the camera meter the whole bright scene drops the subject into underexposed silhouette.
Switch to Spot metering and notice how the auto-exposure changes based on where you tap to focus. Spot meters only the focus point.
Your camera’s metering system is the brain behind automatic exposure. It measures the light in your scene and calculates the combination of aperture, shutter speed, and ISO needed to produce a well-exposed image. But not all scenes are created equal, and no single metering approach works perfectly for every situation. That is why your camera offers multiple metering modes, each one measures light differently, and choosing the right one for the scene in front of you is one of the most practical skills you can develop as a photographer. This guide explains how each metering mode works, when to use it, and how to handle the tricky lighting situations that fool even the best metering systems.
How Camera Metering Works
Before diving into the modes, it helps to understand what your camera’s meter is actually doing. The metering sensor reads the light reflected from your scene and tries to calculate an exposure that renders the scene at a medium brightness, roughly equivalent to 18% gray. This works beautifully for most average scenes where there is a mix of lights, darks, and midtones.
The problem arises when your scene is not average. A snow-covered landscape is predominantly white, but the meter does not know that, it assumes the scene should average to middle gray and underexposes, turning the snow dull gray. A black cat on a dark couch is predominantly dark, but the meter overexposes it, trying to brighten everything to middle gray. Understanding this fundamental behavior is the key to using metering modes effectively and knowing when to override them with exposure compensation.
Evaluative / Matrix Metering
Evaluative metering (Canon) or Matrix metering (Nikon) is the default and most sophisticated metering mode on modern cameras. It divides the entire frame into a grid of zones, often hundreds or thousands, and measures the brightness in each zone independently. The camera then uses algorithms (often incorporating subject recognition, distance data from the autofocus system, and a database of common scene types) to calculate an exposure that balances all the zones.
Evaluative/Matrix metering is the right choice for the vast majority of shooting situations. It handles complex scenes with mixed lighting remarkably well and produces accurate exposures in everyday conditions, outdoor portraits, landscapes, street scenes, travel photography, and group shots. Modern implementations are impressively intelligent, often detecting backlit subjects and compensating automatically.
When to use it: As your default metering mode. Leave your camera in evaluative/matrix metering for general shooting, and switch to another mode only when a specific situation calls for it.
When it struggles: High-contrast scenes where the background is dramatically brighter or darker than the subject (strong backlighting, spotlit performers on dark stages), and scenes that are predominantly very light or very dark.
Center-Weighted Metering
Center-weighted metering measures the entire frame but gives significantly more importance to the center of the image. The central area (typically a circle covering about 60-80% of the frame’s center) has the most influence on the exposure calculation, while the edges and corners contribute less.
This mode predates evaluative metering and was the standard on film cameras for decades. It is predictable and consistent, which some photographers prefer over the more complex algorithms of evaluative metering. Because it prioritizes the center, where subjects are often placed, it tends to expose for the subject reasonably well even when the background is much brighter or darker.
When to use it: Portraits where the subject fills the center of the frame, scenes where you want more predictable metering behavior than evaluative provides, and backlit situations where you want to ensure the center (typically your subject) is properly exposed even if the bright background blows out.
When it struggles: Compositions where the subject is off-center, because the meter will prioritize whatever is in the middle of the frame regardless of where your subject is.
Spot Metering
Spot metering measures light from a very small area of the frame, typically 1-5% of the total image area, centered on the active focus point or the center of the frame (depending on your camera model). It ignores everything outside that tiny circle.
This gives you surgical precision over what the camera meters from. You can point the spot at your subject’s face, meter from it, and get a perfect exposure for the skin tones regardless of what the background is doing. A performer lit by a single spotlight against a black stage, a bird against a bright sky, a subject standing in front of a window, spot metering handles all of these by letting you tell the camera exactly what to base the exposure on.
When to use it: High-contrast scenes where the subject and background differ dramatically in brightness. Backlit subjects. Stage and concert photography. Wildlife against bright or dark backgrounds. Any situation where you need the exposure to be based on a specific element in the frame rather than an average of the whole scene.
When it struggles: Rapidly changing compositions where the metering spot might accidentally land on a bright or dark area instead of the subject. Spot metering requires deliberate aim and technique, it is not a set-and-forget mode.
Partial Metering
Partial metering (available primarily on Canon cameras) falls between center-weighted and spot metering. It measures a larger area than spot metering (approximately 6-10% of the frame, centered) but a smaller area than center-weighted. Think of it as a wider spot meter.
Partial metering is useful when you want more precision than center-weighted metering provides but find spot metering too narrow and sensitive to small aim variations. It is a good choice for portraits where the face does not fill the entire center of the frame, and for general use in tricky lighting when you want to meter from a specific area without the extreme precision (and potential for error) of spot metering.
Metering for Tricky Scenes
Some scenes consistently fool camera meters regardless of which mode you use. Here is how to handle the most common problem scenarios:
Backlit subjects. When the light is behind your subject (shooting toward a window, a sunset, or a bright sky), the meter sees all that brightness and underexposes, turning your subject into a silhouette. Solutions: use spot metering on the subject’s face, add +1 to +2 stops of exposure compensation in evaluative mode, or use fill flash to illuminate the subject.
Snow and bright sand. Predominantly white scenes cause the meter to underexpose, producing gray snow and dull sand. Add +1 to +1.5 stops of exposure compensation to keep whites white. Check the histogram, the data should be pushed to the right side without clipping.
Dark backgrounds and low-key scenes. A subject against a dark background (a dark stage, a night scene, a dark interior) causes the meter to overexpose, washing out the subject and making the background too bright. Reduce exposure by -1 to -2 stops, or spot meter on the subject itself.
High-contrast scenes with mixed lighting. A room with a bright window and a dark interior, or a landscape with a bright sky and dark foreground, exceeds the camera’s dynamic range. Meter for the most important element (usually the subject), accept that one end will clip, or use techniques like HDR bracketing or graduated ND filters to manage the contrast.
Exposure Compensation and Metering
Exposure compensation is the tool that makes metering modes truly powerful. It lets you tell the camera, “I know what you think the correct exposure is, but I want it brighter (or darker) by this much.” It is available in every semi-automatic mode (aperture priority, shutter priority, program) and works with all metering modes.
The most effective workflow is to leave your camera in evaluative/matrix metering for most situations and use exposure compensation to correct when the meter gets it wrong. Snow scene? Dial in +1. Dark-skinned subject against a light background? Dial in -0.5. Moody low-key portrait? Dial in -1. This approach is faster and more reliable than constantly switching between metering modes.
When shooting in manual mode, exposure compensation does not change your settings directly, instead, it shifts the meter indicator (the scale in your viewfinder), showing you where your current settings fall relative to the meter’s recommendation plus your compensation. This is useful for maintaining consistent exposure across a series of shots when the metering would otherwise fluctuate.
Common Mistakes with Metering Modes
- Constantly switching metering modes. This creates inconsistency and slows you down. Most professionals leave their camera in evaluative/matrix metering 90% of the time and use exposure compensation to fine-tune. Switch to spot metering only for specific high-contrast situations.
- Trusting the meter blindly in extreme lighting. The meter assumes average scenes. Scenes that are predominantly bright or dark will be exposed incorrectly unless you compensate. Learn to recognize these situations and apply exposure compensation instinctively.
- Forgetting to reset exposure compensation. After dialing in +1 for a snow scene, it is easy to forget to zero it out when you move to a different subject. Develop the habit of checking and resetting compensation when you change scenes.
- Using spot metering carelessly. Spot metering on the wrong part of the scene, accidentally metering off a bright highlight or dark shadow, will produce dramatically wrong exposures. Be deliberate about where you place the metering spot.
- Not checking the histogram. The metering modes help your camera make an educated guess about exposure, but the histogram shows you the actual result. Meter, shoot, check the histogram, and adjust. This feedback loop is how you consistently nail exposure.
Frequently Asked Questions
Which metering mode should I use as a beginner?
Start with evaluative (Canon) or matrix (Nikon/Sony) metering and leave it there. It is the most versatile mode and handles the widest range of situations well. As you develop your skills, learn to recognize when the meter is being fooled (backlit scenes, snow, dark backgrounds) and use exposure compensation to correct it. Add spot metering to your toolkit once you are comfortable with the basics of exposure.
Does metering mode matter when shooting in manual?
Yes. Even in manual mode, the metering system is active, it drives the exposure indicator scale in your viewfinder that shows whether your current settings will produce an under, over, or correctly exposed image. The metering mode you select determines what the camera considers “correct” for that scene. In manual mode, many photographers prefer evaluative or spot metering and use the indicator as a reference point while making their own exposure decisions.
What is the difference between spot metering and partial metering?
The primary difference is the size of the measured area. Spot metering reads from approximately 1-5% of the frame, a very small circle. Partial metering reads from approximately 6-10% of the frame, a somewhat larger circle. Spot metering gives more precise control but is more sensitive to small aiming errors. Partial metering is slightly more forgiving while still offering much more precision than center-weighted or evaluative metering.
How do I meter for a backlit portrait?
You have several options. Switch to spot metering and meter on the subject’s face. Use evaluative metering with +1 to +2 stops of exposure compensation. Use fill flash to illuminate the subject against the bright background. Or shoot in manual mode, set the exposure for the subject using the histogram as a guide, and let the background blow out. The right approach depends on whether you want to preserve the background detail or are willing to let it go bright for a backlit look.
Continue Learning
Metering is one piece of the exposure puzzle. Deepen your understanding with these related guides:
- Understanding Exposure
- How to Read a Camera Histogram
- ISO Explained
- Aperture and f-stops
- Shutter Speed Explained
- How to Shoot in Manual Mode