Early 35mm cameras were some of the first cameras to be mass-produced and widely available. The most iconic of these early cameras was the Leica, a German camera that was first released in 1925. The Leica was the first 35mm camera to use a rangefinder, which allowed for more accurate focusing and framing of photos. It was also the first to use a built-in light meter, making it easier to get the correct exposure. The Leica quickly became popular among professional photographers and is still highly sought after today.