Light meter – frequently asked questions

It measures light—either the light falling on the subject or the light reflected back. From this, it calculates the appropriate settings for aperture, shutter speed, and ISO.

Because many cameras do not have one, such as folding and plate cameras. And because an external device is often more accurate than an aging built-in one.

With incident light metering, you measure directly at the subject how much light is reaching it—this is particularly accurate. With reflected light metering, you measure from the camera's position how much light the subject reflects, similar to a built-in meter.

• Digital handheld light meters with a display
• Analog devices with a needle or scale
• Models that also measure flash or are designed for studio lighting

You set the ISO and either the shutter speed or aperture, and the device provides the third value. Some also display the exposure value—practical for older cameras.

With incident light metering, you hold the device against the subject, not against the camera—at eye level for portraits. With reflected light metering, you aim at the subject; in backlit situations, you compensate upwards.

Mechanical ones often remain accurate for a surprisingly long time. With electronic ones, the measuring cell can age. We check the function before setting it up.

Usually not, as it has its own built-in meter. However, it can still be worth it in a studio or with continuous lighting.

Light meters are assigned a condition rating—usually Good, less often Acceptable or Defective. You can see which one it is by the symbol at the top left of the product image and as a line below the price. Find out more: How we check light meters.

No, batteries are not included.

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You can request a return on the Returns page. Regardless of this, your statutory right of withdrawal still applies.