How good is "good enough" in AF micro adjustment? 24-105 L F4 & EOS 6D MkII

[Skip70]

I'm calibrating my lenses (for the first time) on my 6D MII and am encountering an issue that I did not expect.

The 24-105 L F4 keeps showing a near or close focus point, even when I have the calibration dialed out to +15. Yes, I know I could go to +20 but I was surprised it would take that much. Can a lens be that far off?  

[kvbarkley]

Could you be having an infrared problem?

https://bobatkins.com/photography/technical/focus_vs_light_source.html

[ebiggs1]

"There is nothing “odd” about it.  Most consumer lenses have AF motors with too much backlash.  The results are not very repeatable because the AF motors will cause focus to undershoot or overshoot the mark."

That is simply a reason it does not exonerate the Rebel/lens combo. The bottom line, and irony, is the ones that need it the most, for whatever "reason", can't do it. The ones that very rarely need it, have it.

[Waddizzle]

It would add to the cost of the camera. 

[ebiggs1]

"It would add to the cost of the camera."

Again a reason or excuse not confirmation it is not reality or needed there most.

[Skip70]

Somebody call the cops. This thread has been hijacked. 

[Stephen]

[ebiggs1]

"This thread has been hijacked."

Not really it remains under the purview of how good is good enough using focus adjustment by two extremely experienced photographers. Decades of history. The thought of adding +15 and or considering +20 is not reasonable to any L series lens but perhaps such an adjustment may be reasonable for the lesser Canon gear.

You need to keep in mind this forum is for discussion and this is simply "good enough micro AF adjustment" discussion. If it no further interests don't read it.