Mirrorless camera is now popular. Camera have evolve for the past generation from larger format to now full frame and APC sensor. Mirrorless was original created in the 1907 with Minilota company. The mirror on the body camera was bigger and the film and was 2 times far from the to the body of the camera.
Large format camera have similar design with the mirroless camera. The similary of both camera is the body of the camera and the lens is far and the lens of the camera have same diameter. Sony, Nikon and Canon design their mirrorless camera base of one orignal mirroless camera.