Hello everybody,
I wish you a happy New Year 
Let me clarify a bit this question of focus.
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The Sony FE 24-105mm F4: in early December we modified DxO Optics Modules for this lens because some configuration of Focal/Focus were not well corrected in distortion. Before the modification the focusing distance was considered as non inlfuent on the distortion correction (focus min to max would end up with same default for the same focal). The correction showed it was wrong.
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Focusing distance in Sony cameras: for a long time we didn’t get the focusing distance in Exif on Sony cameras. Now we do but Exif reading Sony A7 III has not been modified yet so Optics modules will still consider we don’t read it. It will be modified later.
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Focus slider: There is an ambiguous focusing distance when slider “focusing distance” is available in pannel “Geometry”. This slider is present or absent for all images made with same couple camera + lens.
If there focusing distance isn’t declared as ambiguous in module then slider won’t be present for Windows and will be grayed out for Mac.
so when focus slider is present and usable it means that the focusing disance you set with it well have an impact on distortion correction (sometimes it wont as maybe focus has influence for some focal but not all). By default focus distance is set to max value, as it is the most common one. -
Focus values: inifinty value we can have in Exif has evolved through years that’s why you can have 40 or 128 for some lenses we did support some years ago.
I hope it’s clearer now.
Regards,
Marie