Sony SAL1118 Service Manual page 45

3. Checking Method
1) Calculate the flange back (f'F) of the checking lens using the following formula, and check that the specification of the Table 4-4-1 is
satisfied.
Flange back (f'F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
Focal-length f'F (mm)
f (mm) (Infinity position)
18 44.65 to 44.75
2) When the flange back (f'F) of the checking lens is out of specification of the Table 4-4-1, perform "4-4-2. Flange Back (f'F)
Adjustment".
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
Focal-length
f (mm)
18
15
13
11
Table 4-4-1
4-14
f'F (mm)
(Infinity)
44.53 to 44.59
44.48 to 44.64
44.50 to 44.62
44.56 to 44.61