| Exposure Mode | How It Works |
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Auto ( ) | Camera automatically selects all exposure settings. |
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| Program (P) | Camera automatically selects aperture & shutter speed; you can choose a corresponding ISO speed & exposure compensation. With some cameras, P can also act as a hybrid of the Av & Tv modes. |
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| Aperture Priority (Av or A) | You specify the aperture & ISO; the camera's metering determines the corresponding shutter speed. |
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| Shutter Priority (Tv or S) | You specify the shutter speed & ISO; the camera's metering determines the corresponding aperture. |
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| Manual (M) | You specify the aperture, ISO and shutter speed — regardless of whether these values lead to a correct exposure. |
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| Bulb (B) | Useful for exposures longer than 30 seconds. You specify the aperture and ISO; the shutter speed is determined by a remote release switch, or by the duration until you press the shutter button a second time. |
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