Someone on the X1D group just shared this:
https://www.alpa.ch/en/article/back-adapter-hxd
Looks like with the adapter, you can pair the X1D to the TC/STC/Max and get infinity focus with SB17 lenses. If I’m reading it right, you can also mount SB17 lenses directly to the camera with the adapter and the 11mm FPS multifunction adapter. There are other combinations available too.
https://www.alpa.ch/en/article/back-adapter-hxd
Looks like with the adapter, you can pair the X1D to the TC/STC/Max and get infinity focus with SB17 lenses. If I’m reading it right, you can also mount SB17 lenses directly to the camera with the adapter and the 11mm FPS multifunction adapter. There are other combinations available too.