In the discussions of the Hassy H bodies and the Phase XF, Hassy's True Focus feature is often mentioned as a significant advantage over the Phase.
In perusing the XF manual, I came across the following:
"AF-Lock:
When the camera is set to either the Single shot or Continuous AF Drive mode, the focus position can be locked, which is useful for off-center subjects. The AF-Lock function is not assigned to a control button by default. To re- configure the front or rear user button, or assign the feature to the secondary shutter release button, press the Rear Key and select UI Setup > Control Setup > Rear / Front / 2nd Shut > AF lock.
1. Focus on the subject using the Single shot or Continuous AF Drive mode.
2. Press and hold the assigned button to lock the focus.
3. Recompose the subject in the viewfinder."
I haven't (yet) used the XF and I've never used the Hassy H, so someone correct me if I'm wrong, but:
I am assuming this focus lock feature doesn't work the same as True Focus. That is, I'm assuming that True Focus actually refocuses the lens after you do "focus and recompose" in order to compensate for "yaw" (or whatever is the correct term). Whereas, presumably, the XF's focus lock is like the focus lock on my Nikons: it holds the selected focus position, but does not actually refocus the lens to account for vertical or horizontal rotation as a result of "focus and recompose". All correct?
If so, then: wouldn't it be a fairly straightforward software/firmware matter, given that the ability to "store" a certain focal distance via focus lock is already built in, to update the focus lock feature to incorporate True Focus-like functionality? That is, a new instruction/function and menu item essentially telling the camera "when Focus Lock has been activated and "Adjust for Yaw" is turned on, adjust the lens to remain focused on the originally-selected and locked focus point."
What am I missing? One would think if it were this easy, every camera offering a focus lock feature (including my Nikons and Leica S) would incorporate this functionality...