Similar to a camera lens, a viewfinder consists of several concave and convex lenses. A camera with a fixed focal length lens only requires a single set of viewfinder lenses for the specific focal length. However, if multiple focal lengths must be supported, the camera needs to have as many sets of viewfinder lenses in different configurations. It is also necessary to consider the light path of both optical and electronic viewfinders. Constraints of the camera's body size were another element of difficulty. Determined to incorporate a Hybrid Viewfinder to the interchangeable-lens X-Pro1, Fujifilm explored several systems.
Via Thomas Menk