出典:Wikipedia
出典:『Wikipedia』 (2011/05/12 16:35 UTC 版)
Zeiss Ikon (ZI) was the result of several German lens and camera manufacturers joining forces in 1926 to survive the depression in Germany during the 1920s. ZI made extremely fine and expensive cameras during the 1930s, some also with an interchangeable lens, culminating in 1935 with the 35mm Twin-Lens Reflex (TLR) Contaflex camera that has an oversized reflex finder in order to make it suitable for the small 35mm cine film format. In 1932, ZI had launched the well made and complex 35mm rangefinder (RF) Contax, both useful only for a limited range of focal length lenses, neither solving the design problems using the small 35mm film format. Nor was the new Ihagee Kine Exakta, launched in 1936, that employed the single lens reflex (SLR) concept perfect; its waist-level finder image was reversed. The solution that the opticians at ZI eventually devised for this inconvenience was a complex finder prism (pentaprism) placed just above the focusing screen that provided a right way round magnified eyelevel finder image.