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4-14
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
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
Focal-length
f’F (mm)
f (mm)
(Infinity)
18
44.53 to 44.59
15
44.48 to 44.64
13
44.50 to 44.62
11
44.56 to 44.61
Table 4-4-1
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
”
.