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4-5
SAL20TC (2x TELE CONVERTER) (2 X Teleconverter)
4-3-2. Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• SAL135F28 (product)
Adjusting Method
1)
Perform “4-3-1. Flange Back (f’F) Check”, and check that the flange back (f’F) of the checking lens is out of specification of the
Table 4-3-1.
“4-3-1. Flange Back (f’F) Check” is done with the SAL135F28 (product) detached, and flange back value only of the SAL135F28
(product) is measured.
2)
Calculate focus error amount using the following formula.
Focus error amount = { Flange back value (f'F) - SAL135F28 (product) Flange back value (f'M) + 0.06 mm } / 3
Focus error amount: Amount that should be adjusted by the back adjustment washer thickness.
f’F:
Flange back value (Reading value) of the checking lens.
f’M:
Flange back value (Reading value) only of SAL135F28 (product).
3)
Adjust the back adjustment washer thickness according to the result of step 2). (Refer to Table 4-3-2 and Fig.4-3-5.)
Note:
Use the micrometer gauge (or slide gauge) to measure the back adjustment washer thickness.
If focus error is a negative value: Decrease back adjustment washer thickness by error amount to increase flange back.
If focus error is a positive value:
Increase back adjustment washer thickness by error amount to decrease flange back.
Back adjustment washer
Parts No.
T (mm)
A
2-687-648-01
0.05
B
2-687-649-01
0.07
C
2-687-650-01
0.1
D
2-687-651-01
0.2
E
2-687-652-01
0.5
Table 4-3-2
Fig.4-3-5
4)
Install the back adjustment washer, and perform “4-3-1. Flange Back (f’F) Check” again.
Back adjustment washer
Ver. 1.3 2008.12
The changed portions from
Ver. 1.2 are shown in blue.
Ver. 1.2 are shown in blue.
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