This shoe-mounted viewfinder allows for comfortable viewing when using the 25mm ZM lens on the Zeiss Ikon camera. It also features framelines for a 28mm lens.
The Zeiss Ikon camera viewfinder is designed to be used with lenses of focal lengths 28mm, 35mm, 50mm and 85mm. 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.