The Fujinon XF100-400mm is the most expensive piece of glass you can buy for the X system. Ironically, this was also the lens that made me switch to the Fujifilm X system.
Nanda Kusumadi's Blog
The Fujinon XF100-400mm is the most expensive piece of glass you can buy for the X system. Ironically, this was also the lens that made me switch to the Fujifilm X system.