With the Optical View Finder – X70 | FUJIFILM X
X70 is a camera that pursued simplicity, but there is no reason for users not to customize it. We have prepared the optional accessories for X70 so that the camera would suit your style even more. Among the accessories is the external optical viewfinder „VF-X21“. „Why bother to attach an external finder for a camera with no finder?,“ you may wonder. If you actually try it, you will find that this accessory is indeed an interesting piece. Even if you own X100 series or X-Pro series cameras or even DSLRs, we are certain that you will find this finder interesting. The finder mechanism used on „VF-X21“ or X100 and X-Pro2 is „reverse Galilean“. As mentioned in „What does the finder see?“ story, this type of finder has the advantage of seeing things outside the frame. „VF-X21“ in particular covers up to angle of view of 21mm equivalent, so you will see things in a really wide angle of view…..
Source: With the Optical View Finder, X70 | X Stories | FUJIFILM X