15
FinePix4800Zoom(U/E/EG) SERVICE GUIDE
4. Adjustment and Inspection
(2) Preparations for Flash adjustment (Fig.B)
As Flash adjustment is easily affected by exter-
nal light, the area around the gray chart should
be as dark as possible.
The chart is mounted at a distance of 100 cm
from the reference face of the camera (see *1).
An Oxford Gray (No.22) chart (manufactured by
Superior) with a reflectivity of 18±0.7% is used
as the gray chart.
(3) Environment setup for AF adjustment
(Fig.C)
1) The distance from the reference face (see *1)
to the AF chart is 620±5mm for both the INF
adjustment and 600mm adjustment, however
with INF adjustment a 600mm conversion lens
is fitted at 30±5mm from the reference face
(see *1). The conversion lens is not used with
600mm adjustment.
2) Illuminate the AF chart with the light source.
Ensure that the brightness at the surface of
the AF chart is 9.0~12.0Ev.
3) Locate the conversion lens concentric with the
camera lens.
* Measurement
Place the filter (LB140) against the pattern box.
With the filter (LB140) in contact with the color temperature meter, adjust the pattern box color tempera-
ture to 6100 ± 50 K.
*1: The camera reference face is the front face on the outside of the camera.
Baseplate
(
∑
-13-3/Sigma Optical
Equipment)
Lens holder (
∑
-40-50/
Sigma Optical Equipment)
Stand (
∑
-32-130/Sigma
Optical Equipment)
Conversion Lens Unit
<Fig.C> AF Adjustment Environment
AF chart
O f=600mm conversion lens
620±5mm at INF adjustment
620±5mm at 600mm adjustment
30±5mm
Fluorescent lamp stand
Gray chart
100cm
<Fig.B> Preparations for Flash Adjustment
Camera
