” To put it simply, the EV button allows your to quickly underexpose (darken) or overexpose (brighten) your image. How it works is pretty simple. When you’re taking a photo, the camera’s job is to adjust itself by changing the shutter speed and/or apperture to properly expose your shot so that it’s not too bright or too dark. Some cameras do this better than others but that’s another story.”
” In P mode, the camera will adjust the EV by changing the shutter speed and/or the apperture. In S/Tv mode, since you set the shutter speed manually, it will adjust the aperture to compensate. In A mode, the camera will change the shutter speed since you manually control the apperture.”
