Unlike Sony a6000, Canon 5D has a config parameter "focusinfo", which has
coordinates of the available focus points and a bitmast of the selected
ones:
```
eosversion=4,size=5616x3744,size2=5616x3744,points={{-1173,0,101,84},{-561,280,101,84},{0,501,74,101},{561,280,101,84},{1173,0,101,84},{561,-280,101,84},{0,-501,74,101},{-561,-280,101,84},{0,0,131,123}},select={},unknown={ff010000ffff}
```
`unknown` corresponds to the selected focus points.
I can observe how its value changes when I manually select different point
on the camera. But I can't set this value. Is there a special command for
it?
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