The converter consists of nine elements in five groups and adds 30.2mm to the physical length of the camera/lens set-up. With the 2-stop light loss, the AF system of the X-cameras will revert to contrast detection with the 100-400mm F4.5-5.6 lens, but phase detection will still work with the 50-140mm F2.8. Both lenses will need a firmware update in order to operate with the new teleconverter so that adjusted aperture and focal length values can be recorded in the EXIF data and displayed on-screen.
Fuji suggests that the converter will be compatible with other lenses in the X-Series range, and has set up a website on which it promises to post information about future lens compatibility.
The Fujifilm XF2X TC WR teleconverter will be available in June priced $449