The Zeiss Ikon camera viewfinder is designed to be used with lenses of focal lengths 28 mm, 35 mm, 50 mm and 85 mm. When using shorter focal length lenses a dedicated viewfinder for framing has to be attached to the accessory shoe on top of the camera. Focusing of the lens is to be made by using the camera range finder.
Reviews Zeiss Viewfinder ZI for Zeiss Ikon Camera When Used with 21mm ZM Lens