Sony SAL55200 Service Manual ▷ View online
4-7
SAL55200-2 (DT 4-5.6/55-200 SAM) (DT 55-200mm F4-5.6 SAM)
4-3.
OPTICAL AXIS CHECK/ADJUSTMENT
4-3-1. Optical Axis Check
1.
Perform “LENS GENERAL ADJUSTMENT GUIDE 3. FLANGE BACK (f'F) CHECK/OPTICAL AXIS CHECK”
Specification
WIDE end
TELE end
CB (Deflection from center)
0.13
0.19
AS (AS on the axis)
0.09
0.13
Table 4-3-1
2.
If the optical axis does not satisfy the specification, perform “4-3-2. Optical Axis Adjustment”.
3.
If the optical axis satisfy the specification, perform “4-4-1. Projective Resolving Power Check”.
4-3-2. Optical Axis Adjustment
1. Adjustment Procedure
1)
Remove the rear light shield barrel.
2)
Loosen three screws shown in Fig.4-3-1 and adjust by shifting the 4th lens barrel-B assy up and down or right and left.
Fig.4-3-1
3)
After adjustment, tighten the screws to fix the 4th lens barrel-B assy.
4)
Perform “4-3-1. Optical Axis Check” again. If the specification is not satisfied, repeat steps 2) to 3).
5)
If the specification is satisfied, perform “4-4-1. Projective Resolving Power Check”.
Rear Light Shield Barrel
Three Screws
4-1-2. Adjustment Flow Chart
4-8
SAL55200-2 (DT 4-5.6/55-200 SAM) (DT 55-200mm F4-5.6 SAM)
4-4.
PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT
Equipment (Only the specific equipment is listed)
• L-shaped hex. wrench (1.27mm)
4-4-1. Projective Resolving Power Check
1.
Perform “LENS GENERAL ADJUSTMENT GUIDE 4. PROJECTIVE RESOLVING POWER CHECK”
Specification
Number of the smallest pitched lines/mm
Focal length f (mm)
Distance (m)
Center (y' = 0)
Peripheral (y' = 9)
S
M
55
3.63
100
6.25
80 lines or greater
40 lines or greater 40 lines or greater
200
11.90
Table 4-4-1
2.
Check the projective resolving power. If the projective resolving power does not meet the specification, perform “4-4-2. Projective
Resolving Power Adjustment”
4-1-2. Adjustment Flow Chart
4-9
SAL55200-2 (DT 4-5.6/55-200 SAM) (DT 55-200mm F4-5.6 SAM)
4-4-2. Projective Resolving Power Adjustment
Note:
Check the projective resolving power. If the specification is not satisfied, perform the projective resolving power adjustment.
Perform the following adjustments so that each specification is satisfied.
1. Projective resolving power (Partial blur) Adjustment, 2. Projective Resolving Power (Curvature of field) Adjustment.
1. Projective Resolving Power (Partial Blur) Adjustment
Check the projective resolving power. Confirm the condition of Partial Blur, and adjust if necessary.
1)
Remove the zoom rubber.
2)
Set the focal length of lens to 200 mm.
3)
Check the projected image plane and get the front-focus tendency position.
4)
Adjust the partial blur by bending the 2nd lens group lens frame (made of plastic) at the front-focus tendency position.
Note:
• Handle the following screws using the hexagon wrench (1.27 mm).
• When setting the focus ring to over-infinity end, the 2nd lens group frame can be seen from the zoom ring hole.
• The screw holes on the 2nd lens group frame are three. 0 to 2 screws are screwed in on factory shipping.
• Adjust finely with changing bending amount by “screwing new one”, “tightening existing screws” or so on the 2nd lens group
frame at the front-focus tendency position.
Screw
Part No.
Description
3-279-371-01
6U2.6X2.5C3C
Table 4-4-2
Fig.4-4-1
Zoom Rubber Ring
Screw
Screw
Screw
4-10
SAL55200-2 (DT 4-5.6/55-200 SAM) (DT 55-200mm F4-5.6 SAM)
2. Projective Resolving Power (Curvature of field) Adjustment
Confirm whether the peripheral projective focal plane is located forward or backward with respect to the central projective focal
plane, and adjust if necessary.
1)
Set the focal length of lens to 200 mm and adjust the focus so that the center “y’ = 0” reaches the maximum resolution.
2)
Check the resolution of each peripheral “y’ = 9”. (Check whether it locates in front or at back of the central projective focal plane.)
(1) In case that the peripheral plane is located at back of the central plane, decrease the G10-11 adjustment washer (fine-adjust-
ment).
(2) In case that the peripheral plane is located in front of the central plane, increase the G10-11 adjustment washer (fine-adjustment).
G10-11 ADJUSTMENT WASHER
Part No.
Description
t (mm)
3-279-372-01
G10-11 ADJUSTMENT WASHER
0.05
3-279-372-11
G10-11 ADJUSTMENT WASHER
0.03
3-279-372-21
G10-11 ADJUSTMENT WASHER
0.02
3-279-372-31
G10-11 ADJUSTMENT WASHER
0.10
3-279-372-41
G10-11 ADJUSTMENT WASHER
0.15
Table 4-4-3
Fig.4-4-2
3)
If the projective resolving power does not meet the specification, adjust again.
Note:
When perform this adjustment, perform “4-6. FOCUS-SHIFT CHECK/ADJUSTMENT (APERTURE (AMOUNT OF
SPHERICAL ABERRATION))”.
A
A
G10-11 Adjustment Washer
G11-13 Lens Barrel Assy
Rear Light Shield Barrel
4-1-2. Adjustment Flow Chart
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