Sony SAL85F14Z Service Manual ▷ View online
4-21
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
1000 mm collimator
Checking lens
2. Frange Back (f’F) Check
1)
Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
Fig.4-4-3
2)
Set the focus ring of the checking lens to infinity end position while looking through the microscope, and align the optical axis to the
center of the chart image accurately.
3)
Turn the focusing knob of the tester until the chart image is the sharpest (red and green color areas are equal on the chart *).
*: Position in which the color of collimator chart changes from green into red and come into focus.
Also check the optical axis aligns with the chart center. (Refer to Fig.4-4-4.)
Note:
Figure shows example. The cause depends on individual lens.
Fig.4-4-4
4)
Calculate the flange back (f’F) of the checking lens using the following formula.
Flange back (f’F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
*
: When the flange back (f’F) of the checking lens is out of specification, perform “Flange Back (f’F) Adjustment”.
Specification
Focal-length
f’F (mm)
f (mm)
(Infinity position)
85
44.60 to 44.64
Table 4-4-1
Optical Alignment
Best alignment
Best alignment
Incorrect aligned
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
4-22
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
4-4-2. Over Infinity (Infinity End) Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Adhesive bond (B-10)
Adjusting Method
1)
Perform “4-4-1. Confirmation of flange-back (f’F)” and confirm that the flange-back value (f’F) of lens does not meet the specifica-
tion in Table 4-4-1.
2)
Adjust the lens focus to the infinite.
3)
Observing the microscope, adjust the focus by turning the knob of flange-back measuring equipment.
4)
Calculate the shift amount by formula below.
Shift Amount (x) = f’F (measured value) at infinite - 44.62mm
x: Shift amount to be adjusted by backwasher
5)
Depending on the result in step 4), adjust the thickness of backwasher. (Refer to Table 4-4-2.)
Note:
Measure the thickness of backwasher with micrometer or calipers.
• When the shift amount (x) is the positive (+) value: Increase the thickness of backwasher by a value of x.
• When the shift amount (x) is the negative (-) value: Decrease the thickness of backwasher by a value of x.
Description
Part No.
T (mm)
Back Adjustment Washer A
2-684-123-01
0.05
Back Adjustment Washer B
2-684-124-01
0.07
Back Adjustment Washer C
2-684-125-01
0.1
Back Adjustment Washer D
2-684-126-01
0.2
Back Adjustment Washer E
2-684-127-01
0.5
Table 4-4-2
4-23
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
6)
Build in the backwasher and perform “4-4-1. Flange-back (f’F) check” again.
Specification
Focal-length
f’F (mm)
f(mm)
(Infinity position)
85
44.60 to 44.64
Table 4-4-3
Fig.4-4-5
7)
When the flange back (f’F) is out of specification of the Table 4-4-3, repeat steps 2) to 6) again.
Screws
Lens Mount Block
Back Adjustment Washer
4-24
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
8)
After the adjustment is completed, the coupler adjustment washer of the same thickness as the thickness of the back adjustment
washer that uses it by the adjustment is selected and used.
Description
Part No.
T (mm)
Coupler Adjustment Washer A
2-684-057-01
0.05
Coupler Adjustment Washer B
2-684-058-01
0.07
Coupler Adjustment Washer C
2-684-059-01
0.10
Coupler Adjustment Washer D
2-684-060-01
0.20
Coupler Adjustment Washer E
2-684-061-01
0.50
Table 4-4-4
Fig.4-4-6
Screws
Lens Mount Block
Back Adjustment Washer
Coupler Adjustment Washer
Coupler
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