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edited Apr 13, 2017 at 12:43

Based on experience, I am certain you are confusing exposure and exposure-compensation.

Exposure is a product of 3 parameters: ISO, shutter-speed, aperture. In Manual mode, you control all of these and doing so sets the exposure. @jrista shows very clearly how to control each of them. For how they relate, see What is the exposure triangle?What is the exposure triangle?.

Exposure-compensation (EC), marked on most cameras including yours by a ± sign, is an offset from the exposure the camera is computing in automatic (P, Auto) and semi automatic mode (S, A). In all these modes, the camera computes an exposure (based on the metering mode metering mode) and EC is how you tell the camera to adjust the computed value by a certain amount.

In other words:

In all modes except manual: The camera computes an exposure and you use EC to tell it to make things brighter or darker relative to its guess.
In manual mode: You set the exposure exactly using Aperture, Shutter-Speed and ISO. There is no offset the camera can apply because all the parameters have been fixed by you.

Based on experience, I am certain you are confusing exposure and exposure-compensation.

Exposure-compensation (EC), marked on most cameras including yours by a ± sign, is an offset from the exposure the camera is computing in automatic (P, Auto) and semi automatic mode (S, A). In all these modes, the camera computes an exposure (based on the metering mode) and EC is how you tell the camera to adjust the computed value by a certain amount.

In other words:

In all modes except manual: The camera computes an exposure and you use EC to tell it to make things brighter or darker relative to its guess.
In manual mode: You set the exposure exactly using Aperture, Shutter-Speed and ISO. There is no offset the camera can apply because all the parameters have been fixed by you.

Based on experience, I am certain you are confusing exposure and exposure-compensation.

Exposure-compensation (EC), marked on most cameras including yours by a ± sign, is an offset from the exposure the camera is computing in automatic (P, Auto) and semi automatic mode (S, A). In all these modes, the camera computes an exposure (based on the metering mode) and EC is how you tell the camera to adjust the computed value by a certain amount.

In other words:

In all modes except manual: The camera computes an exposure and you use EC to tell it to make things brighter or darker relative to its guess.
In manual mode: You set the exposure exactly using Aperture, Shutter-Speed and ISO. There is no offset the camera can apply because all the parameters have been fixed by you.

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created Jun 15, 2011 at 13:18

Itai

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Based on experience, I am certain you are confusing exposure and exposure-compensation.

Exposure-compensation (EC), marked on most cameras including yours by a ± sign, is an offset from the exposure the camera is computing in automatic (P, Auto) and semi automatic mode (S, A). In all these modes, the camera computes an exposure (based on the metering mode) and EC is how you tell the camera to adjust the computed value by a certain amount.

In other words:

In all modes except manual: The camera computes an exposure and you use EC to tell it to make things brighter or darker relative to its guess.
In manual mode: You set the exposure exactly using Aperture, Shutter-Speed and ISO. There is no offset the camera can apply because all the parameters have been fixed by you.