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Sony SAL1870 Service Manual page 35

Lens for dslr camera
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Ver. 1.4 2008.01
The changed portions from
Ver. 1.3 are shown in blue.
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:
Average "G" value of the three images shoot with checking lens: (b)
Calculate button
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 checking lens (b) - Average "G" value of master lens (a)
Specification
Aperture error = 0 ±12
2) When the aperture error is out of specification, perform "4-2-2. Aperture Diameter Adjustment".
SAL1870 (3.5-5.6/18-70) (DT 18-70mm F3.5-5.6)
(a)
Check the "G" value
4-6

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