Sony DSLR-A300X / DSLR-A350X / SAL55200 Service Manual ▷ View online
4-25
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
2. Projective Resolving Power (Curvature of field) Adjustment
Check the projective resolving power. Confirm whether the focused point should locate in front or at back of the focused peripheral
points, and adjust.
1)
Set the focal length of lens to 200 mm and adjust the focus so that the peripheral “y’= 9” reaches the maximum resolution.
2)
Check the resolution of center “y’= 0”. (Check whether it locates in front or back of the projected plane.)
(1) If the position of maximum resolution of peripheral “y’= 9” locates in back, decrease the thickness of G10-11 adjustment
washer.
(2) If the position of maximum resolution of peripheral “y’= 9” locates at front, increase the thickness of 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 4-4-4
3)
If the projective resolving power does not meet the specification, adjust again.
Note:
When perform this adjusument, perform “4-6. FOCUS-SHIFT CHECK/ADJUSTMENT (APERTURE (AMOUNT OF
SPHERICAL ABERRATION))”.
4-26
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
4-5.
FOCUS-SHIFT/FLANGE BACK (f’F) CHECK/ADJUSTMENT
4-5-1. Focus-shift/Flange Back (f’F) Check
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
1. Preparations
Perform “1. Preparations” of “4-3-1. Optical Axis Check/Adjustment”.
2. Focus-shift/Flange Back (f'F) Check
1)
Rotate the knob of flange back tester and set the 44.56 mm of dial gauge.
2)
Set the zoom to TELE end, focus by turning the focus ring.
3)
Read the flange back values (f'F) of each focal length and confirm that they meet the specification in Table 4-5-1.
Note:
Do not turn the focus ring.
Flange back (f’F) of the checking lens = (SR flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
Focal-length f (mm)
200
135
100
85
70
55
Tolerance of f’F (mm)
Max.
+0.03
+0.15
+0.14
+0.14
+0.14
+0.14
Basis value: 44.56 mm
Min.
–0.03
–0.15
–0.14
–0.14
–0.14
–0.05
Table 4-5-1
4)
If the flange back values of lens checked do not meet the specification in Table 4-5-1, perform
“
4-5-2. Focus-shift/Flange Back (f'F)
Adjustment
”
.
Ver. 1.2 2008.11
The changed portions from
Ver. 1.1 are shown in blue.
Ver. 1.1 are shown in blue.
4-27
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
4-5-2. Focus-shift/Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimeter
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
1. Preparations
Perform “4-5-1. Focus-shift/Flange back (f'F) Check” and confirm that the flange back value (f’F) of lens to be checked does not meet the
specification in Table 4-5-1.
2. Adjustment Procedure
1)
Set the 1000 mm Collimator to 44.56 mm.
2)
Set the zoom to TELE end (f = 200 mm), turn the focus ring to focus.
3)
Set the zoom to WIDE end (f = 55 mm), turn the knob of flange back tester to focus.
4)
Read the flange back values (f’F) of WIDE end, using the formula below, calculate the shift amount.
Shift amount of back adjustment washer (t) (mm) = f’F (measured value) with focal length “55 mm” at the infinity end - 44.56
5)
According to the result in step 4), adjust the thickness of back adjustment washer.
Note:
Be sure to measure the thickness of back adjustment washer with a micrometer (or a caliper).
• In case of negative value (-) of back adjustment washer (t), make the back adjustment washer thinner by (t).
• In case of positive value (+) of back adjustment washer (t), make the back adjustment washer thicker by (t).
Back Adjustment Washer
Part No.
Description
t (mm)
3-277-057-01
Back Adjustment Washer
0.50
3-277-057-11
Back Adjustment Washer
0.30
3-277-057-21
Back Adjustment Washer
0.10
3-277-057-31
Back Adjustment Washer
0.05
3-277-057-41
Back Adjustment Washer
0.04
3-277-057-51
Back Adjustment Washer
0.03
3-277-057-61
Back Adjustment Washer
0.20
Table 4-5-2
4-28
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
Fig.4-5-1
6)
Set the zoom to TELE end and focus to infinity end.
7)
Turn the knob of flange back tester to focus.
8)
Read the flange back values (f’F) of TELW end, using the formula below, calculate the shift amount (X).
Shift amount of 1st lens adjustment washer (X) (mm) = (f’F (measured value) with focal length “200 mm” at the infinity end -
46.12)
÷ 3.47
9)
According to the result in step 8), adjust the thickness of 1st lens adjustment washer.
Note:
Be sure to measure the thickness of 1st lens adjustment washer with a micrometer (or a caliper).
• In case of negative value (-) of 1st lens adjustment washer (t), make the 1st lens adjustment washer thinner by (t).
• In case of positive value (+) of 1st lens adjustment washer (t), make the 1st lens adjustment washer thicker by (t).
1ST LENS ADJUSTMENT WASHER
Part No.
Description
t (mm)
3-277-015-01
1ST LENS ADJUSTMENT WASHER
0.80
3-277-015-11
1ST LENS ADJUSTMENT WASHER
0.50
3-277-015-21
1ST LENS ADJUSTMENT WASHER
0.30
3-277-015-31
1ST LENS ADJUSTMENT WASHER
0.10
3-277-015-41
1ST LENS ADJUSTMENT WASHER
0.08
3-277-015-51
1ST LENS ADJUSTMENT WASHER
0.07
3-277-015-61
1ST LENS ADJUSTMENT WASHER
0.05
Table 4-5-3
Mount Assy
Rear Light Shield Barrel
Back Adjustment Washer
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