V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 404
a.
In the screen that appears, use the
and
keys to adjust the value (+ values move the
focus further away from the camera and
correct for front focus, while – values move the
focus closer to the camera and correct for back
focus).
b.
Press the
OK
button to set that value.
c.
Take a picture and see if that corrected the
focus. If not, repeat Step 6 until it does.
Generally, I verify the difference by taking pictures with
AF fine tune
both
On
and
Off
after doing a calibration.
The photo taken with the
On
setting should be better
focused than the one taken with the
Off
setting, or you did
something wrong and need to repeat the calibration.
Some caveats about
AF fine tune
:
•
Close and infinity focus can be compromised.
When you
make large tuning adjustments, you may make a big
enough adjustment that the camera can no longer get to
infinity (or the close focus marked on the lens).
•
You’re only making an adjustment for the focus distance
you tested.
If you perform your calibration at the closest
focus distance of the lens and then use your lens mostly at
the far points of focus (or vice versa), don’t expect your
calibration to be accurate. Calibrate for the distances at
which you typically use your lens.
•
You only get one calibration for each lens.
A corollary to
the point just made is that you can’t do multiple
calibrations for a single lens, which means a zoom lens
