AF Fine Tune
(User’s Manual – D300S page 312; D300 page 327)
One thing that really impresses me about the D300(S) is its
ability to be fine-tuned in critical areas like metering and
autofocus. Previous to the D300(S), if an AF lens had a back
focus problem, you just had to tolerate it or send it off to be
fixed by Nikon. Now, with the new AF fine tune controls, you
can adjust your camera so that the lens focuses where you
want it to focus.
Nikon has made provisions for keeping a table of up to 12
lenses that you’ve fine-tuned. It recommends that you only
use the fine-tuning system if you know what you are doing,
and only when required. The idea behind fine-tuning is that
you can push the focus forward or backward in small
increments, with up to 20 increments in either direction.
When the little round, green AF indicator comes on in your
camera’s Viewfinder and AF fine tune is enabled for a lens
you’ve already configured, the actual focus is moved from its
default position forward or backward by the amount you’ve
specified. If your lens had a back focus problem and you
moved the focus a little forward, the problem is solved.
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