Inconsistent lens focus position

[fstenico]

I noticed lens_focus_pos range is not a fixed range and changes with lens use, moreover it is not (-32767, +32767) as stated in ZCAM controller focus property tab. For instance, lens_focus_pos=0 could be sometimes a near focus, some other times a far focus.

Is there a way to http query the current focus position? I could not find one. If yes, one could set two extreme values (say +- 100000), check what the lens actually reaches and then use the two queried extremal positions to get the effective position range.

Here is a few focus range I found setting focus positions via http and reading actual lens focus positions through ZCAM controller:
(-3473, 1526) (-4893, 71) (-754, 4221) (-746, 4229)... This yields a focus range of about 5000 positions, but would want to have a method to consistently set it near-middle-far.

EDIT:
Ok I just found one GET /ctrl/get?k=lens_focus_pos and it returns {"code":0,"desc":"string","key":"lens_focus_pos","type":2,"ro":0,"value":-5454,"min":-32767,"max":32767,"step":1} ...
if position is set to 0, it returns -3499; if position is set to -10000, it returns -8474