Exposures can refer to a variety of things, but in this context it is referring to the photographic term. In photography, exposures are the amount of light that is allowed to enter the camera and reach the film or digital sensor. This is controlled by adjusting the shutter speed, aperture, and ISO settings. The term 'shots' is another word for exposures, as each time the shutter is opened and closed, it is considered one shot or exposure.