I used the X100 converter lenses extensively, and have always wished for a way to have the X100 detect the attached converter lens and change the profile automatically. Up until the X100T, I've assigned a button to change the profile, but during the heat of the moment I have forgotten to change the profile back more than once, shooting WCL using TCL profiles and vice versa.... With the recent release of Fuji X100F however, it's now possible for the the camera to detect the installed lens. The camera uses magnet installed in the converter lens, using different polarity, to make contact with the camera and automatically switch out lens profile according to what is attached. The bad news is that only the version II of the TCL and WCL has this feature built in, while remaining optically identical. The good news, however, is that we can add a simple magnet to the TCL and WCL to make them X100F compatible (detection). This is very good for previous X100 users who has already purchased the lens. You can even buy used lenses at a much discounted rate and apply this hack, and it'll be exactly the same as the version IIs, not having to spend 350 dollars for the inclusion of an extra magnet.