Sony SAL75300 Service Manual page 43

4-4-2. Flange Back (f'F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
Note:
Focus-shift adjustment must be completed before flange back (f'F) adjustment.
Adjusting Method
1) When the focus-shift adjustment is not completed, perform "4-5. FOCUS-SHIFT CHECK/ADJUSTMENT".
2) 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.
3) Calculate focus error amount using the following formula.
Focus error amount = Flange back (f'F) reading at focal length (75 mm) - 44.75 mm
Focus error amount: Amount that should be adjusted by the back washer thickness.
f'F: Flange back value (Reading value)
SAL75300 (4.5-5.6/75-300) (75-300mm F4.5-5.6)
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