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4-15
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
4-4-2. Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
Note:
“4-4-3. Focus-shift Adjustment” must be completed before performing the Flange Back (f’F) Adjustment.
1. Preparations
1)
Remove the focus rubber.
2. Adjusting Method
1)
Perform “4-4-1. Flange Back (f’F) Check”, and check that the flange back (f’F) of the checking lens is out of specification of Table
4-4-1.
2)
Set the zoom ring of the checking lens to Tele end position (focal length: 18 mm)
3)
Set the support barrel assembly of the checking lens to over infinity position.
4)
Turn the knob of the flange back tester until the chart image is the sharpest while looking through the microscope.
5)
Calculate the shift amount (x) using the following formula.
Shift amount (x) = Measured value - 44.70 mm
Measured value: Flange back f’F at over infinity position (focal length: 18 mm)
x = Shift-amount that should be adjusted by the back adjustment washer.
6)
Adjust the back adjustment washer thickness according to the result of step 5). (Refer to Table 4-4-2.)
Note:
Be sure to measure the thickness of the back adjustment washer by micrometer or vernier caliper.
• When the shift-amount is a negative value: Decrease the back adjustment washer thickness by the amount of shift amount (x).
• When the shift-amount is a positive value: Increase the back adjustment washer thickness by the amount of shift amount (x).
Back adjustment washer
Parts No.
t (mm)
A
2-886-768-01
0.5
B
2-886-781-01
0.3
C
2-886-782-01
0.2
D
2-886-783-01
0.1
E
2-886-784-01
0.05
F
2-886-785-01
0.03
Table 4-4-2
7)
Assemble the back adjustment washer, and perform the “4-4-1. Flange Back (f’F) Check” again.
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