In addition to the most obvious improvement – an increase in resolution from 37.5 to 64 megapixels – the medium format camera features a number of technological advances. Just like its predecessors, the Leica S3 also utilises the Leica ProFormat developed especially for the Leica S-System. With dimensions of 30 x 45 millimetres, it corresponds to the classic 3:2 aspect ratio of the 35 mm full-frame format, but offers a 56 percent larger sensor area. In comparison with its predecessor, the new 64 megapixel sensor developed exclusively for Leica offers a 71 percent increase in resolution, a dynamic range of 15 f-stops and a maximum ISO sensitivity setting of 50000 – thereby providing sufficient reserves to be ready to handle any imaginable lighting situation and fully exploit the strengths of the medium format. Subjects can be composed in the large and bright SLR viewfinder, focused sharply with the fast and reliable autofocus and captured at a continuous shooting rate of three frames per second. In addition to all other essential exposure settings, an electronic levelling aid (horizon) can also be displayed in the viewfinder. Whenever required, the LCD screen displays a Live-View image with a refresh rate of up to 60 fps is available in both still picture and video recording mode.