Sony DSLR-A850 - Manual (Page 130)

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You can finely adjust the focus of each lens.
Perform this operation only when needed. Note that you may not be able to
properly focus on a subject if you have made a poor adjustment.
You can register adjusted values of [AF Micro Adj.].
Select the desired value with v/V on the multi-selector, then
press the center of the multi-selector.
Notes
• When [AF Micro Adj.] is not set to [On], you cannot register an adjustment value.
• By shifting the value toward +, the focus point shifts toward the background, and by
shifting it toward –, the point shifts toward the foreground. Decide the value by
reference to the result of a test shooting.
• We recommend that you decide the value under actual shooting conditions.
• When you attach a lens that is registered on the camera, the registered value is
displayed. When you attach an unregistered lens, “±0” is displayed. If “–” is
displayed as the value, then a total of 30 lenses have been registered. When you want
to register a new lens, attach a lens for which you can delete its registered value, and
set that value to “±0,” or reset the values of all the lenses with [Clear].
• If you perform AF fine adjustment with a lens of other manufacturers, the
adjustment values of Sony, Minolta, and Konica Minolta lenses may be affected. Do
not use this function with any lens of other manufacturers.
• You cannot individually perform AF fine adjustment when using the Sony, Minolta,
and Konica Minolta lenses that have the same specifications.
AF Micro Adj.
On Registers the adjustment value of the attached lens or focuses
on a subject using the registered value. Adjustment values are
set between –20 to +20.
Off Does not perform AF fine adjustment.
Clear Clears the values of all the registered lenses.
After a message appears, select [OK] with v on the multi-
selector, then press the center of the multi-selector.
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