Exposure

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Making adjustments to any of these not only affects your exposure but also the look of your photo. Your camera can usually solve all your exposure needs using Auto modes.

What Is Exposure? (A Beginner’s Guide)

However, learning how the different elements affect your photos will give you the confidence to take manual control. The resulting images will then stand out from the rest.

This video explains how to use the aperture, shutter speed and ISO settings to get the right exposure and effect for your photo. Aperture is the size of the hole in the lens through which light passes. Each lens has a range of aperture settings from large to small. Use Aperture Priority mode Av to control the aperture whilst still letting your camera look after overall exposure.

Aperture is measured as an f-number. These two shots are exposed similarly but with different apertures. See how using a small aperture for the image on the left creates a greater depth of field with lots of in-focus areas. Enlarging the aperture in the image on the right reduces the depth of field, so much less is in focus. Shutter speed is the length of time that light is allowed to fall on the sensor.

It is expressed in seconds. Use Shutter Priority mode Tv to control the shutter speed whilst still letting your camera look after overall exposure. Slow shutter speeds are used for adding movement such as blurring flowing water in a stream. Compare these two shots taken with very similar exposures but with different shutter speeds, see the effect of using a slow shutter speed on the flowing water. For long exposures you will need to use a tripod or support to prevent camera shake.

ISO sets the light sensitivity of the sensor. It can therefore be used to amplify the light hitting the sensor allowing greater flexibility with shutter speed and aperture. The ISO typically starts at a figure of and rises as the sensitivity increases. ISO can also deteriorate the image quality in the form of grain, or noise, in your images and muted colours. The scene on the right is a lot darker than the one on the left.

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To maintain a shutter speed fast enough to shoot without a tripod you will need to increase the ISO to compensate. Controlling exposure is a juggling act between these three settings. For example, increasing the shutter speed to freeze fast action may underexpose your image. To compensate you need to increase the aperture.

Similarly, decreasing your aperture to maximise front-to-back focus will require a reduction of the shutter speed. Thomson Course Technology. Camera light-field field instant pinhole press rangefinder SLR still TLR toy view Darkroom enlarger safelight Film base format holder stock available films discontinued films Filter Flash beauty dish cucoloris gobo hood hot shoe monolight Reflector snoot Softbox Lens Wide-angle lens Zoom lens Telephoto lens Manufacturers Monopod Movie projector Slide projector Tripod head Zone plate.

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Views Read Edit View history. In other projects Wikimedia Commons. By using this site, you agree to the Terms of Use and Privacy Policy. Q e [nb 2]. Radiant energy density. Radiant energy emitted, reflected, transmitted or received, per unit time. This is sometimes also called "radiant power". Radiant flux per unit frequency or wavelength.

Radiant flux emitted, reflected, transmitted or received, per unit solid angle.

This is a directional quantity. Radiant intensity per unit frequency or wavelength. Radiant flux emitted, reflected, transmitted or received by a surface , per unit solid angle per unit projected area.

Exposure (photography) - Wikipedia

This is sometimes also confusingly called "intensity". Radiance of a surface per unit frequency or wavelength. This is sometimes also confusingly called "spectral intensity". Irradiance Flux density. E e [nb 2].

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Radiant flux received by a surface per unit area. Spectral irradiance Spectral flux density. Irradiance of a surface per unit frequency or wavelength. J e [nb 2]. Radiant flux leaving emitted, reflected and transmitted by a surface per unit area. Radiosity of a surface per unit frequency or wavelength. M e [nb 2]. Radiant flux emitted by a surface per unit area. This is the emitted component of radiosity. Radiant exitance of a surface per unit frequency or wavelength. Radiant energy received by a surface per unit area, or equivalently irradiance of a surface integrated over time of irradiation.

This is sometimes also called "radiant fluence". Radiant exposure of a surface per unit frequency or wavelength.

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This is sometimes also called "spectral fluence". Radiant exitance of a surface , divided by that of a black body at the same temperature as that surface. Spectral exitance of a surface , divided by that of a black body at the same temperature as that surface.

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Radiance emitted by a surface , divided by that emitted by a black body at the same temperature as that surface. Spectral radiance emitted by a surface , divided by that of a black body at the same temperature as that surface. Radiant flux absorbed by a surface , divided by that received by that surface.

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This should not be confused with " absorbance ". Spectral flux absorbed by a surface , divided by that received by that surface. This should not be confused with " spectral absorbance ". Radiance absorbed by a surface , divided by the radiance incident onto that surface. Spectral radiance absorbed by a surface , divided by the spectral radiance incident onto that surface. Spectral radiance reflected by a surface , divided by that received by that surface.

Spectral radiance transmitted by a surface , divided by that received by that surface. Hemispherical attenuation coefficient.