Canon EOS D60, Service Manual

Page: 126 / 211

1.9 AF Focus Adjustment Procedure
With film-based SLR cameras, the flange focal distance was input during AF
focus adjustment and then the adjustment was made. Since it is difficult to
measure the distance to the CMOS surface, follow the procedure below. Note that
as with mechanical adjustments, the flange focal distance must be adjusted.
(Since it also affects the CMOS's tilt and viewfinder focus.)
<Adjustment Procedure>
1) Attach the tool lens and connect the camera to the HS-I/F or Multiple Tool II.
Then start up the camera adjustment software.
2) Select "AF adjustment" and "AF focus adjustment."
3) Follow the on-screen instructions and do the adjustment with aging and three
charts.
4) Obtain a 3-D chart and place the camera 2.5 meters away from the center of
the 3-D chart.
(Be sure to illuminate the chart with a video light or other light source.)
5) Photograph.
•
Shooting conditions
Shooting mode
: Aperture-
priority AE
Aperture :
f/1.8
ISO : 100
White balance : Auto
Image size : JPEG (Fine)
AF point : Center only
6) Import the image to an image-editing program such as Photoshop. Check the
image to see how much it is off from the chart. (Good only at the center)
7) If there is no error, the adjustment is completed. If the focus is shifted, correct
the focus with AF focus shift. Calculate the shift amount as shown below. The
AF focus shift can be adjusted in 0.005 mm increments. After completing the
AF shift, repeat from step 5 above to check the adjustment.
CCD off-position amount =
=
*
•
The defocus amount relative to the subject is the 3-D chart's off-position
amount expressed in mm.
•
Positive correction (+) will result in a front focus, and negative correction (-) will
result in a rear focus.
Off-position amount relative to subject
×
1
2500 (EF 50mm f/1.8, at 2.5 m)
Off-position amount relative to subject
×
1
(magnification)
2
Part 4: Electrical Adjustments
4-16
For the AF adjustment, there is no need to input the flange focal
distance. After the AF adjustment, photograph a 3-D chart and
check the focus. If fine adjustment is necessary, adjust by shifting
the AF focus.
CAUTION