I just bought the Nikon D7000 as my first DSLR camera. I'm extremely new to this and have been reading through the manual/youtubing videos and trying to learn all of it's functions. I'm not sure exactly what I did but now when I hold down the shutter half way it doesn't autofocus. When I hold down the Autofocus button on the left side of the camera and try to move the dial to adjust the settings nothing happens at all whereas before I remember it would change the settings.
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