INON Diopter Correction Lens [+1.5D] for 45VF-II/STVF-II

- Optional accessory for 45º Viewfinder Unit II for X-2/Straight Viewfinder Unit II for X-2
- Add-on correction lens to shift +1.5 m^-1(dpt) for those who are unable to adjust with camera’s viewfinder diopter adjustment range due to long sight or presbyopia.

For example, camera’s viewfinder diopter adjustment range of -3.0 to +1.0 m^-1(dpt) will be -1.5 to +2.5 m^-1(dpt) at INON viewfinder with the Diopter Correction Lens [+1.5D].
- The Diopter Correction Lens [+1.5D] has to be installed before diving by drop it inside of the viewfinder from housing side and tighten it by packaged tool.


Tips of diopter adjustment
Under bright circumstance on land, human eye’s pupil shrinks making diopter adjustment easy as depth of field is deep while the adjusted viewfinder may not get perfect focus and hard to see viewfinder image when the pupil gets open in dark underwater as the depth of field gets shallow especially with presbyopic eyes due to deteriorated focusing function.
Though it varies among different individuals or age, it takes about 15 minutes to open pupils by dark adaption when we get dark underwater. So it would be recommended to conduct diopter adjustment in a dark room (darker than underwater) after staying there for 15 minutes when pupils open as like underwater enabling to get perfect focus of viewfinder image even underwater where pupils will open.
Since this diopter adjustment method works good enough, expensive diopter adjustment function on a viewfinder is not required.