4-6
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
4)
Click the calculate button to measure the image.
5)
After measuring, check the
“
G
”
values.
Average
“
G
”
value of the three images shoot with master lens:
(a)
Average
“
G
”
value of the three images shoot with checking lens: (b)
Fig.4-2-7
3. Checking Method
1)
Calculate aperture error using the following formula, and check that the aperture error is within the specification.
Aperture error = Average
“
G
”
value of master lens (a) - Average
“
G
”
value of checking lens (b)
Specification
Aperture error = -- 50 to
±
10
2)
When the aperture error is out of specification, perform
“
4-2-2. Aperture Diameter Adjustment
”
.
Calculate button
Check the “G” value