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4-29
SAL135F28 (STF 2.8(T4.5)/135) (135mm F2.8 [T4.5] STF)
4-4-2. 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. Flange Back (f’F) Check”, and check that the flange back (f’F) of the checking lens is out of specification of the
Table 4-4-1.
2)
Set the distance scale tube of the checking lens to infinity end position.
3)
Turn the focusing knob of the flange back tester until the chart image is the sharpest while looking through the microscope.
4)
Calculate the shift amount (x) using the following formula.
Shift amount (x) = Measured value (f’F) at infinity end position - 44.61 mm
x = Shift amount that should be adjusted by the back adjustment washer
5)
Select the thickness of the back washer according to the result of step 4). (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 washer
Part No.
Description
Thickness (mm)
2-688-527-01
Back adjustment washer A
0.05
2-688-528-01
Back adjustment washer B
0.07
2-688-529-01
Back adjustment washer C
0.1
2-688-530-01
Back adjustment washer D
0.2
2-688-531-01
Back adjustment washer E
0.5
Table 4-4-2
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