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10-28-2011, 03:25 PM   #1
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Do AF adjustments add up?

I was playing with the AF adjustment for my stable of lenses and found my DFA 100 macro is maybe a +11 or +12. I moved the global adjustment with the lens adjustment at +10 and nothing happened. Is there a sequence you need to follow, one before the other or should they just add up. Dave

10-28-2011, 03:29 PM   #2
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I dint think so.
Is this just one lens that needs so much adjusting? If yes, its probably just this lens that may need re-calibration.

Or do you have to adjust other lenses in the ~+5 and above range? If yes, send your camera to CRIS for recalibration with a master lens.
10-28-2011, 04:27 PM   #3
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With K200D (in not Pentax supported debug mode) the corrections do add up.
It is scaled in um, and if I want to shift AF by 130um (0.13mm), I do shift by 100 um, then do it a second time by 30um. To go back to zero correction, it is also a 2 step procedure.

Of course, this may be different with the K5 (the K200D in debug mode has only global adjustment).
10-28-2011, 07:15 PM   #4
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The global adjustment only applies if no lens-specific adjustment is set for the current lens.

10-28-2011, 07:41 PM   #5
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Definitely not additive - you either do a global (applies to all lenses) *OR* per lens.

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