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Camera Exposure Calculator

Aperture Setting
f /

Exposure Time
s

Sensitivity Setting
ISO

Exposure Value
EV₁₀₀ =


Lock It

Round to nearest third-stop.

How to use exposure calculator:

1. Enter the camera settings for a known exposure.
2. Lock the exposure.
3. Tweak indivdual settings, watch the others adjust to keep exposure consistent.
4. Output will change as you enter different camera settings.

Additional Information:

• EV = log2(N2 / t) where N = f-number and t = exposure time in seconds.
• EVS = EV100 + log2(S / 100) where S = desired ISO.
• This calculator can be used to plan long exposures outside a camera's typical range. (Photo exposure calculator. Camera exposure calculator.)

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Each setting controls exposure differently:

Aperture: controls the area over which light can enter your camera
Shutter speed: controls the duration of the exposure
ISO speed: controls the sensitivity of your camera's sensor to a given amount of light

One can therefore use many combinations of the above three settings to achieve the same exposure. The key, however, is knowing which trade-offs to make, since each setting also influences other image properties. For example, aperture affects depth of field, shutter speed affects motion blur and ISO speed affects image noise.

A camera's shutter determines when the camera sensor will be open or closed to incoming light from the camera lens. The shutter speed specifically refers to how long this light is permitted to enter the camera. "Shutter speed" and "exposure time" refer to the same concept, where a faster shutter speed means a shorter exposure time.

A camera's aperture setting controls the area over which light can pass through your camera lens. It is specified in terms of an f-stop value, which can at times be counterintuitive, because the area of the opening increases as the f-stop decreases.

The ISO speed determines how sensitive the camera is to incoming light. Similar to shutter speed, it also correlates 1:1 with how much the exposure increases or decreases. However, unlike aperture and shutter speed, a lower ISO speed is almost always desirable, since higher ISO speeds dramatically increase image noise.