Image stabilisation is necessary to correct camera shake. These movements can be involuntary by the photographer or small vibrations from the earth that will affect the quality of the image. Normally, image stabilisation is necessary in two situations: when using a slow shutter speed or when using a telephoto lens.
During these situations, if the camera does not have correct image stabilisation, the image may be blurry or distorted. To correct this from happening, SLR cameras can feature one of two image stabilisation systems: the optical stabiliser or the mechanical stabiliser. The following table explains each system further: